The point appears to be that making representations of Mohamed is a profanation of the holy.

So maybe the problem is that people who believe in the holy are a threat, because they are liable to get unreasonably worked up over actions which they perceive to be a profanation of the holy.

Since the definition of what's holy and what behaviours are profanations of the holy seem to be completely conventional (given the very large numbers of religions disagreeing over what's holy and what's profanation), maybe the problem is the very concept of the holy.

If you are not convinced, try it on someone who has not been entirely debauched by economics. — Piero Sraffa