An endless volume of tweets under every charged trending topic violates these rules, which are being surfaced and promoted by the platform. And it enables mob mentality like nothing we've seen before.
Moderation is mostly just theater, especially as long as the platform itself is quite literally encouraging the core behavior.
Your Twitter feed is yours. It's like your home territory. People feel like they're entitled to defend this territory. Twitter assists inflammatory media as it attempts to invade this territory, originally with retweets, but more recently with algorithmically selected tweets coming from people who you didn't follow, selected for "engagement". But it does more than that. When you defend your territory, your defense ends up on someone else's feed as a provocation.
The original model worked, with tweets from your followers only, and no retweet support except copy and paste and the letters RT. The current model is cursed.
So like having hashtags in your profile, you could include ban-lists there, and your preferences would be calculated (and people could see what your filters were).
Yes, this wouldn't solve the issue of filter bubbles but the Twitter's algorithms could augment how to weight people's ban-lists with actual mentions/RTs - so I would see someone on only one of my ban-lists but got a lot of RTs/mentions I'd see it. If I find I'm not seeing stuff I should, I could alter my lists