You have a very clear understanding of why Muslims want to kill infidels.
He is bound by his service to Allah to spread the Koran. This is his chosen method of reaching out to people. Plus his actions are protected by the 1st Amendment which prohibits the Government from interferring with his religion or the way he practices it.
Mohammedans are cultists, and nowhere in our Constitution does it allow a religion of any sort to kill or maim another human being.
Try again.