really? The actions of one person, who was obviously mentally unstable, or even a group of people can hardly be used to judge an entire religion--let alone an entire race, as not all Arabic peoples are Muslim and not all Muslims are Arabic (think North and Sub-Saharan Africa, Eastern Europeans, people from Southeast Asia, etc)...would you have said the same thing if he was white?
I'm always amazed that people are shocked by these outbursts of violence given the context: a site of pure violence (mechanized violence in this case), a murky never-ending war on an ill-defined enemy, poor psychiatric care and a patient that obviously needed it...