I don't make any claims as to if Mods/Admins only come in after a report, or watching it on their own.
All I know is threads end up getting closed at a certain point of heat/tension generally, and it's rarely something they make any sort of comment on before closing rather than "This is out of hand", which usually leads to suggest it was closed because they or someone else did not like the rising conflict, which given as this is an RP site and not a debate site makes sense.

And hold on, we're debating about debates.
DEBATECEPTION!