Even if he cheats, he won't find anything here.

No, I won't register there just to see everything myself. You answer me: how and why is it connected that a player added someone to their personal blacklist, and the player's rating? And who came up with this?

emphasizing polite communication, even with unstable individuals

Seriously? Do you want everyone who doesn't want problems to fawn over unstable individuals? Why should anyone communicate with unstable individuals, except for their treating physicians? And can I have a list of those who want to? I'm just having trouble explaining to you what's wrong here if you don't want to see it. Maybe someone else can explain it.
The only solution to any problems with unstable individuals is: a ban. Preferably with parameters that make it difficult to create a clone.