So we agree that it doesn't make sense in a normal way. And you said that if it was done at all it must make sense in some way. That's really my point – in what twisted covert scenario does it make sense? Sometimes stupid people do things that don't make sense in any way; and it does make a kind of sense for a sleezeball of any ethnic background to try to make a buck by degrading himself and the world around him, as Stim suggested. But in political matters when something doesn't appear to make sense there's often a more complex explanation.
The Coptic Orthodox Diocese of Los Angeles issued a statement to the same affect. They disassociated themselves and their flock from the film-maker, pointing out that his action was diametrically opposed to Christian teaching and longstanding Coptic practice, and they suggested that the film-maker had an ulterior motive. And they asked that we not take the usual ignorant approach of saying "Well, that shows what those people are like."
The film does no harm to Muslims or Islam because it's so crudely made. Have you seen the 14 minute clip on YouTube? It's artistically and intellectually equivalent to writing "Muhammed very bad man" on a placard, but infinitely more tedious.