Earlier quoted context omitted.
What exactly makes you uncomfortable with calling genocidal racism "Wrong(TM)", and helping people leave it? Are you also uncomfortable with them banning child porn, or is that an example of punishing wrongthink too? EDIT: I invite downvoters to tell me why they disagree?
I think you have a misunderstanding of the word "white nationalism". I'd recommend looking it up to understand what is happening here. But in short it means the belief that there is a white race and that it has a right to preserve itself and it's culture. Genocidal racism was never allowed on facebook. After this move they will censor a lot of legitimate things.
And this idea of "preserving itself"... what exactly does that mean? Does that mean getting to kick other people out of their homes? Threaten their livelihood? Threaten their social safety nets? What exactly happens in this supposedly benign process of "preserving culture"?