In my opinion, this would cause much Arabs to see that the USA is fair, and perhaps, more will be against terrorism. I truly feel that this issue causes much people to HATE the USA.
As for the other questions, I do not know they are very difficult questions. The version of Islaam which is followed by these who do the attacks, is very fundamental, and very strict. It's goal is to install a Muslim system of law (Shar'ia) upon the world, because it is believed that if anyone follows the laws of a man-made system, they are obeying this man-made system, making them servants to something other than God; which is strictly forbidden in Islaam. It saddens me much that they are using Islaam as a justification to attack and kill innocents: it is forbidden multiple times in the Qur'an as well as the Hadith to make war on innocents, children, elderly, women, and other believers. It seems that the ones who do these acts, only read that which they wish to read in the Qur'an.