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 SPD used the Proto-fascists to murder their enemies. This is undebatable. It happened.
That’s not what you claimed. You claimed they worked with the Nazis, which they absolutely did not.