With the 2016 election came a ton of division. Trolls were allowed to run wild. This never really ended. Through the pandemic, insurrection and everything that's followed it's been utter and absolute chaos. Trolls with multiple handles everywhere trying to flood this clearly left-leaning board with far right ideals or purely create chaos.
The owner wasn't hearing the frustration expressed by users though, just the increased ad revenue from engagement largely driven by emotion and anger. Thus why he has let it fester. Twitter seems an extreme variation of this to me, and I foolishly thought Twitter with Elon would do something better with moderation initially