You seem to believe that the 'final solution' to the Jewish problem in Nazi Germany, including mass murder and gassing them, was a well-known and socially approved act. To the best of my knowledge it was not. The 'nazis' were not a uniform group of horrible people; they were a small group of horrible people who controlled a country whose populace was, though hostile towards the Jews, not inherently evil and in no way was responsible for the worst horrors of the Holocaust.
Saying that it's appropriate to kill a million people in a city? That there is no moral burden whatsoever in doing so? Yeah, I'd say that compares to the Nazis pretty well. Continually comparing your enemies (which you forced off of their land some time ago and currently keep inside a country-sized prison) to animals and worse, not caring if they live or die? Yeah. Compares to Nazis.
And yes, the US compares to Nazis sometimes as well, when we interred Japanese for no reason, in other actions. Not everything the Nazis did was the Ultimate Evil. Much of it was merely an efficient war machine. It is the attitudes and promulgation of hate from the top of one's government that is the true comparison...
Despite the calls to forcibly transfer Palestinians, and even the lunatics advocating their extermination this doesn't come anywhere near what the Nazi's did.
No? Why not? In the end, the Palestinians will be forcefully transferred - nice term there - or dead. There is no material difference between this and the plans of the Nazi party, who merely carried out those same calls. We even have top religious officials proclaiming that there is nothing wrong with it at all.
The only fallacy of the comparison? The Jewish state hasn't gotten around to committing the acts that their leaders wish to commit. There is a clear arc of increasing violence and decreasing tolerance amongst the political and social leaders in Israel, and it's troubling to say the least.