Reasons behind Karzai's outburst against the US http://www.crescenticit.com/news-a-analysis/1863-may-2010/2761-reasons-behind-karzais-outburst-against-the-us.html

A spontaneous demonstration erupted in Qandahar city denouncing both the Americans and Kar-zai. They demanded that foreign troops get out of Afghanistan and called Karzai an American puppet. One resident said, “They are supposed to protect us. Why are they killing us?” The Qandahar shooting was preceded by Karzai attending a meeting of 1,700 provincial elders at which he asked whether they supported a planned US offensive against the Taliban in Qandahar.

General Stanley McChrystal, US commander for Afghanistan was also present. The elders unanimously rejected the planned military operation, at which point Karzai announced that if they did not support it then there would be no operation. McChrystal was visibly shaken at this public rebuke. But killing of civilians pales into insignificance compared with the manner in which American and other foreign occupation forces violate Afghan cultural norms.

Barging into people’s homes in the middle of the night is one such act that has aroused the most resentment among Afghans. One such raid was carried out by US Special Operations forces on February 12 near Gardez in which five people were killed including two pregnant women. In recent months both American and Canadian troops have confirmed that Afghan civilians have thrown stones and spat at them while hurling abuse even in areas far away from the scene of killings.