Authors:

The Pashtuns feel discriminated against by the Americans because they supported the Taliban and the war is still going on in their region with continued U.S. bombing. They are also disgruntled at the overwhelming power of their ethnic rivals the Tajiks, who dominate the security forces in Kabul and control the key levers of political power. Although Karzai is a Pashtun also, many Pashtuns consider him a hostage to the Tajiks and Americans.

Source: progressive.org
The Pashtuns feel discriminated against by the Americans because they supported the Taliban and the war is still going on in their region with continued U.S. bombing. They are also disgruntled at the overwhelming power