Opposition to the War in Afghanistan (2001–2021) stems from numerous factors, including the view that the United States invasion of Afghanistan was illegal under international law and constituted an unjustified aggression, the view that the continued military presence constitutes a foreign military occupation, the view that the war does little to prevent terrorism but increases its likelihood, and views on the involvement of geo-political and corporate interests. Also giving rise to opposition to the war are civilian casualties, the cost to taxpayers, and the length of the war.

Disputed legality of the US invasion Opponents of the war have claimed that the attack on Afghanistan was illegal under international law, constituted unjustified aggression and would lead to the deaths of many civilians through the bombing campaign and by preventing humanitarian aid workers from bringing food into the country. By one estimate, around 5,000 Afghan civilians had been killed within just the first three months of the U.S. invasion.

More broadly, the invasion of Afghanistan appeared to opponents to be a stepping stone to the 2003 Iraq War, increasing the geo-political reach of the United States:

Involvement in an Afghan civil war

Opposition also stems from the view that the US-led military forces are taking sides in an ongoing civil war in Afghanistan between its ethnic groups, backing minority Tajiks and Uzbeks against the Pashtun majority of Afghanistan.Quittin' time in Afghanistan

Several weeks into a massive US-led military offensive against the Taliban in four southern Afghan provinces in 2006, Afghan President Hamid Karzai spoke against the killing of so many Afghan citizens:

According to journalist Ahmed Rashid, the noted author of several books on Afghanistan, the Taliban are in the fabric of that country, and defeating the Taliban would involve killing "large numbers of Pashtuns", an ethnic group with a long history in southeastern Afghanistan.

Afghan civilian opposition to the invasion One of the best-known women's organizations in Afghanistan, the Revolutionary Association of the Women of Afghanistan (RAWA), condemned the US invasion of Afghanistan, stating that "America ... has launched a vast aggression on our country".

They accused the US and its allies of "paying the least attention to the fate of democracy in Afghanistan" by first having supported for years a "Jehadis-fostering, Osama-fostering and Taliban-fostering" policy before the 2001 US invasion, only to now be "sharpening the dagger of the Northern Alliance" warlords and drug lords that were key allies of the U.S. in its invasion.

Afghan civilian casualties

Coalition military casualties

The continued and mounting death tolls of foreign military forces in the decade-long war are another factor involved in the opposition to the war in Afghanistan, with hundreds during the war dying per year. By October 2011, the 10th anniversary of the U.S. invasion, over 2,750 foreign soldiers had been killed in the war in Afghanistan.

International public opinion

International public opinion was largely opposed to the war in Afghanistan. Polls around the world – including a 47-nation global survey in 2007, a 24-nation survey in 2008, both a 25-nation survey and a 13-nation survey in 2009, and a 22-nation survey in 2010 – have repeatedly shown considerable opposition to the presence of US and NATO military troops in Afghanistan.

While support for the war in Afghanistan has been strongest in the United States and Israel, recent polls have shown growing American opposition to the U.S. war, including majority opposition: September 2009 – United States: Growing American opposition to the war in Afghanistan reached an all-time high, while support for the U.S. war fell to an all-time low in September. A record majority 58% of Americans now oppose the war in Afghanistan, while only 39% support the U.S. war. The CNN – Opinion Research poll was conducted September 11–13, 2009. September 2009 – United States: "Americans are broadly skeptical of President Obama's contention that the war in Afghanistan is necessary for the war against terrorism to be a success, and few see an increase in troops as the right thing to do." The plurality 42% of Americans want a reduction of the number of U.S. troops in Afghanistan. Only 26% of Americans think more troops should be sent to Afghanistan. 51% of Americans think the war is not worth fighting, while 46% think it is. Fewer than half of Americans think winning the war in Afghanistan is necessary to win the "war on terrorism", with about as many saying it is not. The Washington Post – ABC News poll was conducted September 10–12, 2009.

International protests against the war

The near two decade-long War in Afghanistan has repeatedly been the subject of large protests around the world, with the first large-scale demonstrations beginning in the days leading up to the war's official launch on October 7, 2001 as US "Operation Enduring Freedom".

Foreign military occupation

In January 2009, an independent analysis by the Carnegie Endowment for International Peace in Washington, D.C. claimed that "the majority of Afghans are now deeply opposed to the foreign troops on their soil" and that the presence of a foreign force in Afghanistan is the single most important factor behind the Afghan insurgency. However, according to a May 2009 BBC poll, 69% of Afghans surveyed thought it was at least mostly good that the U.S. military came into remove the Taliban and in a June 2009 Gallup survey found that about half of Afghan respondents felt that additional U.S. forces would help stabilize the security situation.

On October 8, 2009, in a New York Times interview initiated by the White House, a senior White House official described the Afghan Taliban as an indigenous Afghan group that want to win back territory within their own country. The White House comment had come a day after the Taliban reasserted that their aim is "the obtainment of independence".US may shift Afghan war tactics: report

Foreign military raids of Afghan homes A key and long-standing point of opposition to the war in Afghanistan has been the constant raids of Afghan homes by foreign military forces that have persisted despite long-repeated pleas and protests by the Afghan government.

In a visit to Washington in May 2005, Afghan President Hamid Karzai asked U.S. President George W. Bush to let the Afghan government have authority over house search operations regularly conducted by the U.S.-led foreign military forces in his country. Bush rejected the Afghan president's request.

In September 2005, Karzai again tried asking the US-led military forces for changes, saying: "Going into the Afghan homes – searching Afghan homes without the authorization of the Afghan government – is something that should stop now. No coalition forces should go into Afghan homes without the authorization of the Afghan government."

By the spring of 2006, mounting anger over the foreign military raids of Afghan homes, and accusations of foreign troops molesting women during the forced searches, helped prompt Afghan religious leaders to begin calling for armed resistance.

In a December 2008 speech, Afghan President Hamid Karzai said that in the previous month he had again asked that the U.S. military in his country cooperate with his government, sending the U.S. government a list of demands about troop conduct in his country: "Part of that list was that they shouldn't, on their own, enter the houses of our people and bombard our villages and detain our people." He gave no indication of having received any response back from the U.S.

In November 2010, he yet again repeated his protest during a Washington Post interview: "The raids are a problem always. They were a problem then, they are a problem now. They have to go away. The Afghan people don't like these raids, if there is any raid it has to be done by the Afghan government within the Afghan laws. This is a continuing disagreement between us."

Destruction of Afghan homes and crops In 2010, US-led offensives inflicted more than $100 million in damage to Afghan homes and fruit crops in southern Kandahar province, according to an Afghan government report in January 2011. The government delegation led by President Hamid Karzai's advisor said that the foreign military forces had inflicted unreasonable damage and caused the displacement of many people.Nato offensive inflicts Afghans $100 mln damage in Kandahar

Two months earlier, in November 2010, the Afghan Rights Monitor (ARM), a human rights group, also reported widespread damage of Afghan homes in the same three districts, Arghandab, Zhari, and Panjwai, where tens of thousands of foreign forces had been carrying out military offensives over the past year.

Rejection of the terrorism argument

A Washington Post – ABC News poll in September 2009 reported that "Americans are broadly skeptical of President Obama's contention that the war in Afghanistan is necessary for the war against terrorism to be a success." Fewer than half of Americans think winning the war in Afghanistan is necessary to win the "war on terrorism", with about as many saying that it is not.

A decade into the war, the Pew Research Center reported in September 2011 that the majority 75% of Americans do not think the war in Afghanistan has lessened the risk of terrorism in their country, and only a minority 25% thought it had. Far more Americans, the plurality 37%, think the U.S. war in Afghanistan has in fact increased the likelihood of terrorist attacks in the U.S.Pew Research Center poll August 2011

A poll at the end of August 2009 found that three-quarters of Britons do not think fighting in Afghanistan makes British people, or British streets, any safer from terrorism, as Gordon Brown and senior ministers repeatedly told them to justify the war.

About a week and a half later, British member of parliament Eric Joyce, a former army major, resigned as aide to Defence Secretary Bob Ainsworth, saying "I do not think the public will accept for much longer that our losses can be justified by simply referring to the risk of greater terrorism on our streets."

In 2004, Jack Cloonan, a 25-year veteran of the FBI who served between 1996 and 2002 on the joint CIA-FBI task force that tracked bin Laden, said the number of people in Al Qaeda was "minuscule". A membership list found near Kabul in 2001 during the US invasion of Afghanistan, and obtained by the task force, showed there had been a grand total of 198 members in the organization.

With the US invasion of Afghanistan in 2001, al Qaeda elements moved to Pakistan and other countries.Al Qaeda and Affiliates – Historical Perspective, Global Presence, and Implications for US Policy (Congressional Research Service, February 5, 2010)

On October 8, 2009, in a New York Times interview initiated by the White House, a senior White House official acknowledged that there are fewer than 100 al-Qaida fighters left in Afghanistan and that the Afghan Taliban, an indigenous Afghan group seeking to win back territory within their own country, do not themselves pose a direct security threat to the United States. He said: "When the two are aligned, it's mainly on the tactical front."

The comments were made a day after the Taliban asserted that it did not pose a direct threat to the United States. The Taliban stated that their aim was "obtainment of independence and establishment of an Islamic system" in their country, and not to attack the West. "We did not have any agenda to harm other countries, including Europe, nor do we have such agenda today."

On June 27, 2010, CIA Director Leon Panetta revealed that there were possibly fewer than 50 members of Al Qaeda, and at most 100, in Afghanistan.