Why do I get the distinct impression that if things became openly genocidal you would still decry it as a 'monstrous exaggeration' since Israel could only kill at most 2.5 million to Hitlers 6 million, and besides, the Palestinians have the gall to actually fight so it would be self defense.
Hitler used racism/nationalism, the victimization of the German people under the treaty of Versailles, and the 'historically backed' manifest destiny of the Aryan race to subjugate and eventually try to eliminate the Jews.
Israel is using racism/nationalism, the victimization of the Jewish people under Hitler, and the 'historically backed' manifest destiny of God's chosen people to subjugate the Palestinians.
They're already at the point of denying them basic rights, jamming them into ghettos that lack proper servicing, walling them in, and collectively punishing them... which sounds a lot like Warsaw circa 1941. The only thing Israel hasn't done yet is start a wholesale extermination program.
The comparisons are more than valid. You just need to set aside you preconceived notions about who the good guys and bad guys are and look.