You have given them a reason to hate you and to seek revenge.
No, the trick to understanding it knowing the fact the these people can demonstrate against and attack the US because they know we'll put up with this shit. Why didn't Saddam have this problem? After the mass killings of his own people, the torture rooms and stealing billions of dollars from them, his own people still didn't rise up against them. On the other hand, US forces are building schools, hospitals and have held back from retaliating against the people of Iraq, yet we still have a look of bullets flying. Why? I think people need to ask 'does the average Iraqi want US troops to root out the bad guys or does he want things back to the way they were?'