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Yes, you put the nail on the head. There are people who deffend that humor can be made about everything. I'm wondering if they have a problem to see the cruel side of reality and try to scape from it at any cost, even when they can hurt other people's feelings.
Only wait that any relatives of the victims in the earthquake read the "ingenious" joke.

It is a very delicate matter to fix the point where freedom of speech and unacceptable hate meet. I put it in slander.
So in my opinion what Charlie Hebdo has done is vile, but NOT a crime. The answer should come from French society, not buying the magazine at all and forcing it to close.
It would help that the Italian government would issue a formal protest to their French counterpart, and even call for a boycott on French products. The goal must be putting the majority of French population against the magazine and its supporters.

@Cierzo: the best defense against a charge of "slander" is the truth. So respectfully, I don't know if slander would apply. The cartoon is the cartoonists' "take" on an actual situation. It's like the cartoon they drew of the Syrian refugee child, the little boy who drowned. Who could make fun of a dead child ?? But the death occurred. Chances are, people who are outraged by their work don't support them and don't buy their magazine anyway. But again, we're speaking of a different country and culture than the U.S. Do the French regularly boycott media ? Do they assume, for example, if segments of the population don't like a message, it has no right to be voiced ? As far as shutting down the magazine, this is precisely what their Muslim community had been trying to accomplish long before the January 2015 attacks on their office.

@bijouxbroussard: I don't think slander applies here, so the law should not act shutting down the magazine. It is the French people who must decide if they want to go on with that magazine that gives a bad name to their country, using their power as consumers.