Just take a look at the chat on HeroesPortal. It seems to be a well-organized and civilized place.
The WT chat is a real garbage dump, but it was created with the idea of "freedom of speech." Such behavior won't be tolerated on HW, and those who engage in abusive chat will be banned from the forum. That's all.
Added 25 minutes later
Message from Arandor:
Why discuss anything important in the chat when it will be cleared of all messages in 7 days?
In the course of 7 days, there can be many discussions, and the most important ones among the participants will be happening right now (1-12 hours); tomorrow, they will be talking about something else or arguing.
Clearing the chat once a week is just removing outdated material, but ideally, the trash should be removed once a day, but that's not enough for culture – we need online moderators – there are many "villains" in a good sense of the word.
Forgot to add:
Message from Ment:
Usually, in a chat for those who like to chat aimlessly, they discuss all sorts of nonsense that is uninteresting to anyone (except those who are discussing it). Take HeroesPortal, for example; they give each other virtual flowers for money and tell jokes...