I assumed we were speaking of the reaction in this country, not other ones. There wasn't the slightest bit of violence in the United States over those cartoons.
In any case, people being offended from time to time is the consequence of free expression. Again, do you really anticipate that anyone is going to violent over the text of this sign (or others like it)?
If the answer is "yes", do you think such free expression should be curbed?
Religion transcends mere National boarders. This should also be fairly obvious.
Do you think such free expression should be curbed?
No. That wasn't my point either. Only that Either side attempting to use government force to enforce their will on the other is bound to have severe negative unintended consequences.