[DanBC]

Your freedom of speech argument is incoherent.

If you're in the US the US government can't inhibit your freedom of speech - and this includes the speech you make in French.

And if you're in the US and you deny the holocaust it doesn't matter what language you use to do so, when you travel to a country where it's illegal to deny the holocaust you're going to find it tricky. (For varying degrees of tricky including "nothing at all happens; noone knows or cares".)