As for blaming the Holocaust on the Left, it's right there on the f+++ing label, and bald assertions will never convince us that National Socialism was not a part of the Left like International Socialism is. Or that the Left wasn't responsible for the majority of the 20th Century's genocides. Hmmm, were the Young Turks of the Left? On the other hand, while Imperial Japan was collectivist (which was sort of baked in the pie from ~1600 or so anyway), it wasn't of the Leftist flavor.
But, yes, to the extent the inchoate Alt Right has a position on it, one of them is that Jews are to be "excluded if not eliminated from society", as in all societies that are not Israel. You've got your own homeland now, which we of the Alt West fully support, relocate yourself there.
Specifically "diversity + proximity = war", and we want to avoid "war" such as it is or will be.