Er… which suppression are you talking about? I’m a little out of my depth on it but the only suppression I’m aware of came after the KPD started a violent rebellion against them. But like I say I’m not that well aware of it, can you tell me?
When a government gets millions of people killed for no reason, using violence against that government is completely justified.
And I likewise have no idea whose “fault” it was between the SPD and KPD that they were both pretty consistently at each other’s throats.
It was the SPD's fault, for the whole, you know, "war that killed 20 million people" thing.