You will be ridiculed by your peers, not the government, because the reality of the holocaust is very well documented, and deniers are suspected of motivated reasoning. But jailed or killed? I highly doubt that. They aren't comparable in the slightest.
The context defining claims related to the US and China, not Germany. You will not be jailed in the US for questioning the Holocaust.
> harassed, ridiculed
Ok, but still not relevant to the conversation
> Killed
I hesitate to go further off topic, but do you have a citation for this claim?