The internet is one place where 99.9% compliance with a social norm or law isn’t good enough to prevent the remaining 0.1% from causing enough damage to be un-ignorable, even if you manage to get worldwide agreement on updating the law. (Consider that e.g. the UK does not have American freedom of speech, and if anything considers the American way of doing things to be strange and somewhat anarchic).
I sometimes wonder it would help if social media posts had to be deleted after a short period, perhaps a few months or a few years? (The pre-internet social media, being conversations and occasionally letters, was probably >99% forgotten in hours, and most of the rest was hearsay).
Or it would help, or make things worse, if it became easy for people to change identity?