Well, then do reason them.
I think the answer to all three is "no". I am not an atheist, but I have a deeply seated hate for organized religion. For me, nothing is sacred, at least as far as ideas are concerned. I don't see why one should make distinctions based on what some people's notions are of what is "sacred", seeing how "holiness" and the like are unjustifiable by any seriously substantial means.
I can't say for sure, but I doubt those cartoons' intended target audience was the muslim community, anyway. I see my beliefs being ridiculed on the newspapers on a regular basis. Some of them are pretty damn funny, too. And I don't go starting up all kinds of trouble because of that. Again, I don't see why we should keep some ideas free from criticism, even if it's from a humoristic standpoint, just because they are thousands of years old, and wrapped in mysticism and historical inaccuracy. In fact, I find it sadly ironical.
The fact that we are even pondering these questions is sad proof as to the weak moral state we live in, now. Or maybe not, as we will go as far as re-examining the validity of such strongly rooted ideas such as freedom of speech and press, and weight them against... what? Tradition, ignorance, and intolerance. Again, the irony.