Islam makes very large claims for itself. In its art, there is a prejudice against representing the human form at all. The prohibition on picturing the prophet - who was only another male mammal - is apparently absolute. So is the prohibition on pork or alcohol or, in some Muslim societies, music or dancing. Very well then, let a good Muslim abstain rigorously from all these. But if he claims the right to make me abstain as well, he offers the clearest possible warning and proof of an aggressive intent.