You really think that Germans are likely to commit atrocious acts in the future, but are being held back by something like the denial laws?

Additionally, you think Americans 'would never do such a thing'? I don't know how you can argue against denial laws in the US and for them in Germany.

People in general have always had flaws that result in them committing horrible deeds. The holocaust occurred because many individuals committed acts that they were able to rationalize to themselves - which as a whole resulted in a great evil. No law about what people can say in public will prevent such an event.