It's a balancing act between individual and social rights (individual in this case being twitter), but these companies very explicitly build to scale to be a sort of "town hall" and in doing so start having very large social influence the likes of which no one in history has ever had.

When they get to this scale there has to be extra responsibility here for the good of society as a whole.

Or an alternative: people can use social media that doesn't suck whenever something like this happens, and the market forces will punish the stupidity on twitter or any other platform that forgets what's owed to its userbase

I have no idea why your first instinct is to regulate when twitter doesn't have a monopoly and there are several very similar alternatives that are growing in popularity