Bottom line: No country has absolute freedom of speech. Freedom of speech is one of the basic liberties, and it's balanced against others. Different countries come to different conclusions on the balance. Generally speaking Germany tends more towards Freedom than the US according to comprehensive surveys [2].
Specifically When it comes to denying history, citing the US Supreme Court: "[There is] no constitutional value in false statements of fact".
[1] https://en.wikipedia.org/wiki/United_States_free_speech_exce...
[2] https://freedomhouse.org/report/freedom-world-2018-table-cou...
You'd have to go with something like "show that the massive decline in the Jewish population of Nazi Germany was by means other than genocide".
Which is also impossible, but due to truth instead of poor epistemology.
It's just that these people are dingbats who have decided ahead of time to deny the Holocaust and desperately search for any shred of broken evidence for this claim.
This is a good thing, because while freedom of speech is important, the general wellbeing of the population and preventing people getting hurt is important as well. It is my belief for example that allowing racist remark under the banner of free speech, hurts more than it helps. It leads to an overall negative impact in the wellbeing of the population. I think the same balance was considered when prohibiting holocaust denial.
Question: why use a throwaway account?
It's an image of itself that the US likes to project though.
Ex: what if the government one day decides that criticizing the government is too offensive?
Unfortunately, I don't see this happening anymore. I don't want to sound gloomy, but the web back in the day had a completely different feel to it. I'm sure I'm not alone in saying that I can feel it's vibrancy dying. Maybe it started a while ago.
Anyway, there's still hope with decentralization and such. I suppose we'll just have to wait and see.
I fail to see how speech does hurts anyone. Would you mind elaborating? Should it not be solely the responsibility of whoever hears said speech to decide on whether to act on it? Does censorship of any shape or form not actually hurt the ones that wanted to listen to said speech the most?
https://www.theguardian.com/world/2006/feb/20/austria.thefar...