So report them if they're doing something wrong, people here seem to complain that SE is too active against toxicity so if someone's threatening someone/harassing him in chat it'd be an easy ban.
Do you personally feel guilty for the actions of others, do you find yourself to be to blame for other people harassing him? If not, why would you be blaming other people who also aren't responsible? From his stream- looks like a small amount of people harassed him for a while when he started; compared to him in classic where people stalked him and stream sniped him for months with the intent of stopping him from being able to play the game at all. If anything, he's getting harassed far less than usual- so perhaps that's a good sign, that his usual stalkers have been largely discouraged due to the community, and maybe we can push the rest of them out by making it clear that's not allowable here.
If you want to see how some in his community act- check out his 'chat ban appeals' to see what they say, almost every episode has at least a few slurs, some extremely disgusting things said about women, and some other highly offensive stuff- some by people who have been following him for years. So it's fully reasonable to believe that those few haters who stalk and harass him everywhere he goes would do so here too.
Or, how about how Blizz representatives themselves treat the guy that gives them millions of dollars worth of free advertising each year? They openly insult and bash him on twitter, and promote people on twitter who are threatening to false flag him.
End of the day- go after the people who are actually harassing him, hold them accountable. Pointing the finger at the rest of the community and saying 'why did you all not stop these random anonymous people from bothering him!' like that's something anyone here can do just makes no sense. Especially if those people are on twitter- twitter's the worst place on the internet, nobody here controls what people there think or say on twitter and we shouldn't pretend we can.
Pointing the finger at innocent people and saying they're part of a toxic community isn't really any better than people calling Asmon toxic for things he can't control, so don't be part of the problem.