I’m a staunch supporter of absolute free speech (as much as possible, caveat “Fire!” in a crowded theater). Denying the Holocaust doesn’t put anyone in imminent danger. I don’t agree with the speech, but I’ll defend the right to speak it (rights are not for the speech we all agree with, but that which is most contentious).

The existence of auschwitz is undeniable; you can visit it. If someone wants to look like a fool, let them. If you believe the fool, equally a fool. If fools are responsible for the suppression of fundamental rights, the system is broken and an immune response should be expected.