Maybe when the Internet was new. But whether you count the Internet's birth in the 1980's with the original cross-content and cross-country links, or around the first dot com boom and bust in 2001, or with the iPhone in 2007, we
know how "the Internet" is going to interact with "the community". We knew this back in
2016 when Microsoft released their "AI" chatbot to Twitter, and Twitter taught it to be a racist asshole in less than 24 hours† and the Internet, collectively said
duh. Of course that was going to happen.
Anyone who's started a new community these days knows they have to start with a sort of code of conduct. That's non-negotiable these days. Would it be better if platforms like Discord did more to address the issue? Absolutely.
You're totally right it isn't easy - but the Internet's a few decades old by now and we know what's going to happen to your warm cosy website that allows commenting. The instant the trolls find it, you either die an MVP or live long enough to build content moderation.
†: https://www.theverge.com/2016/3/24/11297050/tay-microsoft-ch...