The only thing that has really changed is the technology.
Not the people, who consisted of racists and haters and all the same types throughout recorded history.
Not the tactics, which still involve the same disinformation, isolation, and pressure of peers that have always been used.
But since we live in a technopoly we implicitly trust and deploy online technologies without question, technologies that fundamentally change the way we communicate: stripping the reciprocal information of a person's flinch and thus furthering the lack of consequences to being an asshole online, for example. "Game experience may change with online play" now means you may randomly have your kid recruited by some alt-right whackjobs.
Now we are in an era where sock puppets are financed by overseas white supremacists and we don't even know it, because we implicitly trust message board technologies like reddit and facebook that obfuscate and hide real identity and intentions. Terror is spread as public and journalistic figures are forced to shadow dance with threatening accounts that may or may not be 13 year olds who don't know any better, may or may not be nonhuman parts of some politically funded bot empire, or may or may not be an actual psychopath sending a real threat.
Imagine if we deployed drugs the same way we do communication technologies? Am I suggesting some sort of regulation? How would that work?
It wouldn't. The only thing that will fix things is a cultural change, away from fascination with communication technologies that have a lot of whiz-bang, but play the gimmick fo stripping away (rather than including) information--proving that 140 characters at the hands of a madman president is enough to make everyone insane. Twitter and Facebook and Google, our biggest "media companies" now, have no viewpoint at all. They are rodeo masters, hosting the craziness... they are companies that don't generate revenue in any way other than venture capitol... or entirely disrupting existing media economies, holding eyeballs hostage via physchographic manipulation, and selling them to overseas concerns without even knowing it.
Meanwhile the actual press of financial crushing disparity, so much enabled and also obfuscated by technology, has in the U.S. forced both parents away from the home and to work for nearly every sector of the economy but the top. And the acceleration of the technology and its changes and revisions outpaces that capability and comfort level of your average parent to keep up and monitor and communicate with their kid about what's going on.
And so, in isolation, the shadows move in on the kids...
...who are actually not stupid, quite angry, and tired of hearing about how we will bring about justice by focusing on their privilege--as opposed to the unseen and far more obscene privilege of the highly-efficient robber-barons of the 21st century who will happily make everyone outside of their own family a serf regardless of race, gender, or political leaning.