Why are muslims so aggressive?

Truth be told, these "Muslims" that promote hate and riots and such are doing it for their own benefit. There is usually some financial, political, or personal reason for acting so irrationally. Also most of these "Muslims" rather believe in what their grandparents have ped down to them about Islam rather than picking up the Qu'ran and reading it for themselves. The biggest problem with these "Muslims" is that they live in ignrance and believe that thier CULTURE is their religion when in fact most of the cultures that are instilled in Muslim countries are very unIslamic.