It depends on the speech, and its context.
As Oliver Wendell Homes' famous quote advises, free speech does not defend a man who falsly shouts 'Fire!' in a crowded theatre.
So - are you entitled on here to say that you thought the Final Solution was a good idea, stopped before its fruition? Absolutely - it's f roum for debate and discussion.
Shoould you be allowed to say it to a group of Holocaust survivors? That's a different issue, which illustrates my point about time and place.
Free speech is to be appluaded and protected, but as with all freedoms, it comes with responsibilities - you cannot exercise one without recourse to the other.