You cannot abuse your freedom of speech first and foremost, you were born with it and your opinions are yours and if your society is unable to deal with your opinions then it is the society that is sick, not you. Unless these imams were actively involved with the planning and carrying out of these violent attacks then this is nothing but a hatchet job, pure and simple. Prove they were involved or this is nothing but islamophobia.
Your freedom of speech is limited by rules, it isn't absolute to begin with.
Holocaust denial in France is a criminal offense, isn't it?
Even heinous behavior is forbidden if I'm not mistaken.
Although I agree that we shouldn't punish people who holds any opinions, regardless of how bad they are. However, if they are menacing or commit an offense, I can't feel bad knowing they'll be punished.