The heroes are the ones who did this, Patus. The ones championing for more representation, the ones bemoaning cis white males, the ones who talk about oppression and privilege ad naseum to try and educate people to changing how they act. That sort of grand proselyting and moral absolutism is what breeds this sort of activity. Read that post above, read all of them, and you'll see that these are people who don't see themselves as wrong in the slightest, and see everyone else as unethical and immoral for not agreeing with them.
How do you show empathy to that? How do you try to stop, talk, and reason with a belief system designed to inherently shut down such acts and identifies them as a genuine threat to entire races and cultures of people? How are you supposed to act better when you talk to people who really, with all their heart and soul, believe that simply stating an opposing opinion is the same equivalency to slavery, and that you are literally trying to harm people when you do it? What does that even look like? What does it look like to engage in this thing and still be better then these fanatics? What does it mean, to not become part of the problem, when doing nothing validates these peoples view that they are in fact heroes on the right side of history, and discussing things civilly with them results in you being attacked and the entire notion of social justice being reduced to cinder, and fighting back gets you labeled as part of the problem?
The answer is, you can't. You never had a chance in the first place.
It's been great hanging with you guys, really it has. Your a good bunch, and your bouncing around of fan ideas was great to see, even if some of those theories turned out dead wrong. But hey, that's part of the fun of being a fan. Trying to guess what will happen next, and enjoying the reveal regardless. We sometimes disagree on a lot, but we all managed to at least enjoy the show.
See you guys in January. Just don't get involved, even if it lets these monsters win. After seeing these types of stuff unfold, those giving empathy getting torn apart online, those giving resistance getting slandered into oblivion, it's hard for me to have much hope. So you probably should just, you know, give up on helping and stuff.
There's no lesson to be learned from SU that solves this problem. Reality is cruel, and these sorts of problems don't have happy endings like crying breakfast friends tells you. The fact is, nothing we do would change things, so why bother even trying?
Just wait for the hiatus to end, and give up on the fandom. You'll feel better, and you'll learn to stop missing the fan art and songs…eventually.