As anyone can see, the violence is not over class differences (rich vs poor), not because the U.S. is still in Iraq, but because of religious differences. Anyone who says that Islam is a religion of peace KNOWS that she/he's lying.
Members of Al-Qaida cannot be dismissed as wayward radicals. Fighters for al-Qaida are carefully following the writings of the Qur'an. Their interpretation of the Qur'an is the correct one. Of course, other denominations of Islam say the same thing--and to settle the differences, they kill. They blow themselves up inside mosques, at food markets--anywhere there's a crowd. They not only blow themselves up, but they arm bicycles and donkeys with explosive devices and detonate them by remote control. And large segments of the moslem population support all this. New al-Qaida in Iraq Chief Vows Blood-Soaked Days