Remember, the social Democrats sided with the Nazis over the socialists. They’ve done it every time they’ve been given the opportunity, and will continue to do so as many times as people fall for their shtick.
“The master's tools will never dismantle the master's house."
-Audre Lorde
The idea of the USSR being an objectively better entity than what came before and after itself is a hard pill for many to swallow. Even from a cold, pragmatic, and critical position it can be hard to reconcile, even decades after the Cold War proper.