The problem is that the Iraqi people are facing atrocities from both sides - Zarqawi and also the American troops at times. The Zarqawi groups uses car bombs, the Americans use other bombs. You also know what they do in the prisons.
I have no idea what the U.S. intends to do further there and what would be the reaction of the Iraqi people. I only know that the sole option is to leave Iraq to the Iraqi people.