Have you tried querying for specific misconducts and let the LLM focus at one at a time? E.g. Find whether murders were planned or carried out, can you find any signs or plans of bomb-making, can you list all messages related to fire and arson, were any mass manipulation campaigns planned, etc, ...
I have the feeling that would probably be more effective, not sure though.
Well my first query was "is there anything bad in here" and it basically said "no, it's a bunch of weirdos talking about guns, conspiracy theories and politics but there is nothing truly bad in there" - and then I went through a bunch of prompting for a while and very quickly got bored because at least what I was looking at, was just a bunch of americans talking about politics and guns.
I have the feeling that would probably be more effective, not sure though.