Many murders occur when the killer has a paranoid mind-set. He imagines the other person intends to kill him. Muslim propaganda utilizes this factor every day. They portray the west as out to destroy them. Thus, they are guiltless if they strike preemptively.
The Muslim mind equates the possession of nuclear warheads with the intent to use them. Many Muslims believe they have completed a mission just by talking about it. Every day Muslims call for the destruction of all Christians and Jews as a regular part of the prayer ritual. Augment this inculcation by 1400 years.