It's what I like to call the "moderating instinct." The moderating instinct is when people feel compelled to distance themselves from past proletarian movements so that their attackers won't associate them with the supposed atrocities of those movements. But it doesn't work because the attackers will do that regardless. So the moderating instinct leads people to not only distance themselves from their own goals, and to condemn their own movement, but to uphold reactionary lies about their movements, sometimes even outdoing those lies by exaggerating them, in order to further emphasize the attempt to distance. It doesn't matter how much we try to twist and turn and distance ourselves from atrocity propaganda, rubbish will be heaped upon the graves of working class leaders.

Now, at risk of falling victim to this "moderating instinct" myself, there is a very small minority of cases where there were actual atrocities or lapses in judgement or reactionary abberations in the records of particular working class movements, but in practice it is hard to distinguish these real failures which should be acknowledged and learned from internally in our movements from the reactionary atrocity propaganda and concern trolling which should not be fed or indulged in. So it is best practice to not feed the trolls by indulging the moderating instinct. They will not give you any credit for doing so.