Literally the only thing liberals dislike about the Nazis is that the Nazis attacked other western Europeans. If the Nazis had completed Generalplan Ost but left France and Britain alone, liberals would be praising and celebrating them (moreso than they already do) to this day. All the shit the Nazis did, European liberal democracies were already doing in Africa, in Asia, in Australia, and in North and South America. As the saying goes, “Hitler did to Europe what Europe did to the world.”