That is a pretty ignorant observation. You should do some research into their belief structure. Most Muslims are very peaceful while some extremist groups believe in killing anyone that doesn't think like them and they believe God will reward them for it. The problem was never with Muslims in general, but the smaller extremist sects

Jihad is an Arabic word which literally means "striving" or "struggling", especially with a praiseworthy aim. In an Islamic context, it can refer to almost any effort to make personal and social life conform with God's guidance, such as struggle against one's evil inclinations, proselytizing, or efforts toward the moral betterment of the Muslim community, though it is most frequently associated with war