Two points:let me begin by stating that i think this event did not even happen. as a matter of fact, muslims dont have anything to do with my objection to your argument.
you originally stated that the french teacher was at fault for saying things that could elicit a reaction to muslims. because one group might have a violent reaction to something they see or hear, the rest of us should handle the group with kid gloves and tread carefully as to not upset them?
no one group should get special treatment because they are extra sensitive to criticism or ridicule. you can validly argue that the teacher should have used better judgment, but that is absolutely NO excuse for any group or person to physically attack the person. crossing the line from verbal to physical is flat out wrong.
any overly sensitive individuals who need to physically lash out against unpopular speech need to either ignore them and walk away or combat it with more free speech. violence is
1 - Even if it did happen (doesn't look so when we see the decapitated head), the French were in the know and were waiting for it to happen and killed the attacker right-away.
2 - The killing of the teacher was wrong because in Sharia Law there must be an investigation to check whether the teacher was forced to show insulting drawings (naked picture) or whether he was sober or not etc...