Islam is violent because its doctrines attract the most stupid and violent males of the world. ISIS proves that daily.
Some people point out that many Muslims are not violent. That might be true. In fact I had a very kind Muslim prof. in college.
But the facts are the doctrines of Islam through the Koran okay/advocate violence and mysogyny. Therefore, violent, stupid, and sexually screwed-up males are attracted to it.
People of Arab origin have been unfairly characterized as being naturally violent. But the Christian Arabs I've known are just like everybody else.
It's the violent and regressive culture of Islam that turns many people in violent misanthropes.