Fire in a crowded theater. They love that analogy. But look at the case that it was first used in as a concept. Schenck v. United States.
A guy sent out flyers opposing Wilsons draft for WWI and called it a monstrous wrong. They said speaking against the draft was like yelling fire in a crowded theater.
The attack on free speech was more important to America than anything whatsoever having to do with WWI.
SO no thank you, I will not temper my free speech.
Some of the things the muslims and their clerics say are similar to yelling fire in a crowded theater in that they are harmful. Making irreverent fun of an ancient dead murderous criminally insane ideologue is not the same as issuing a fatawa.