Barring freedom of speech in Europe

Full circle, much? Chill out, Germany.

Yes, the Nazis weren't real nice people, what with the totalitarianism and genocide and ill-fated attempts at world conquest. I'm firmly on the side of Nazi = Bad.

But something being bad doesn't mean that people should outlaw the mention of it. One of the consequences of the good guys winning WWII is that you still have the right to call yourself a Nazi. The right to commit genocide? No, sorry, we'll be stopping you. But one of the ways that the Nazi party came into power was by stifling free expression, outlawing certain opinions, and tossing people in jail for voicing unpopular sentiments. We (and by we I mean "the allied powers", not America) stopped them, at a huge cost in lives. If we were the good guys and we fought that war for justice and equality and puppies and such, then we have to tolerate the inevitable outcome.

Another commission official said that Sweden, for example, whose constitution guarantees absolute freedom of speech, could be granted an opt-out if the EU-wide criminalisation was agreed.

Right. Freedom of speech should be the default, not a special fine-print situation.