It's not like we actually have consistent freedom of speech regime going on where the Muslims are the only dissenters, anyway. In practice, freedom of speech in most of the West adheres to the cultural and religious sensitivities of the majority in that society. i.e. what if that cartoonist drew Obama/whoever munching on a baby fetus? A lot less people would be saying "get over it".
Wasn't that already on Southpark, no wait, that was Chrisopher Reeves. We don't have that many holy cows left in the West, for better or worse I suppose.