In Islam to die by means of killing infidels is considered the only guarantee to get into Heaven. I mean to say that in Islam there is nothing about living a good life that guarantees getting into heaven except one thing--to die by means of murdering infidels. So as far as that murderer was concerned, he went out in the only reasonable fashion possible.
[Later note--This post was about some incident that I have forgotten. In any case, I think the point is clear that there is some kind of tendency with Islam which provokes towards violence. I would guess that the reason for this is found in the life of its founder.]
