The liberals, communists and etc. hate when anything they embrace is compared to the Nazi's, but that is just part of their game of deception.
The whitewashing of anything socialist or communist is certainly their agenda, because it is the ideology that they embrace. So, they point their finger at fascism and Hitler to convince people that they are so much better and different, but that is false. Both fascism and communism lead to one thing, dead bodies and a dictator.
Since the end of WWII, it has been the communist agenda to make the differences between communism and fascism so complex and far apart. This is all for the purpose of deception.
Both Stalin and Hitler were socialists and they even signed a PACT. The American liberals embraced Hitler until he turned against the Russians.