Muslims. Thousands of Muslims in Lebanon hate the US, thousands of Muslims in Palestine hate the US, thousands of Muslims in Saudi Arabi and Iran hate the US, thousands of Muslims in Pakistan hate the US... etc. It's not like Al Queda is this giant global organization that has millions of members.
Also, much of the hatred of the middle east and Muslims was long before 9/11. My city has a lot of Lebanese people or "lebs" for short. They hang out in large groups at school and pick on individuals of difference races. They cause trouble at the bus terminal and police are always telling them to stop loitering. They harass women like you wouldn't believe. Normally when a guy hits on a girl and is rejected, the guy stops. Lebs do not leave women alone. Their book is every bit as evil as the Christian bible, but they actually believe what the book says. It says women are second rate pieces of trash, and that's exactly how they treat women. It says infidels are all garbage, and that's exactly how they treat infidels. It says beat your children, and that's why the house next to my friend's house always has screaming coming from it.
Islam should be thought of as a hate organization similar to neo nazis and the KKK. They're really not that far off.