One of the major problems in this hobby is that without the existence of logs, bad behavior is a matter entirely of hearsay that makes it hard to truly understand what's really going on. Over my tenure in the hobby I've seen some really openly bad behavior (Stalking, threats, doxxing, abuse to name a few), but more times than not I'm approached with rumors of these behaviors without evidence.
I'm going to say up front my answer, and then explain why.
My answer? YOU CAN'T, NOT WITHOUT LOGS
This is a text-based hobby, where there isn't any explanation as to why logs can't be presented. This extends even to Discord or any other outside-of-game chats. Sure, they can be falsified and edited, but in theory the person being accused could also present their own logs as evidence of edit. But the one thing that remains true is that you can't deny the existence of logs as a good focal point on determining whether or not bad behavior has happened at all.
Now for the part that some people might not agree with me on, but I feel very, very strongly about this.
- I've been on games where jilted players have used threats of badmouthing the game to fuck them over as a means to get back at the game for upsetting them (where do you think they intend to do this?)
- I've been party to some fairly excessive claims, without logs, that I later found out the other side of the story was a completely different take.
- We just had a thread show up on the Hog Pit where one player caused a stampede on another game on a theory that a player was OPP.
Like it or not, this isn't an environment where things happened exactly as a person claimed that they did because they say it's true. There are people who leverage their reputation over logs, and there are people who know that character assassination on a private, page-level campaign without the existence of logs can do absolute damage to a player or game that they aren't happy with...and it happens. We all know it happens, and it happens more than I think we pay attention to.
So my advice on this thread going forward is to understand that over the history of this hobby there have been some absolute people who deserved the title of "problem players", but there have also been some rather unfortunate victims of aggressive behavior from players who have somehow managed to avoid getting onto that list of problem players (due to cliques, popularity, ownership of games, etc).
How do I personally deal with problem players? I used to get annoyed or upset about it, but nowadays? I don't.
For me, it's simple. If someone does something rude to me on this text-based media, I can log it and forward it to staff. There's no reason to wrestle and there's no reason to lose my cool. I'll forward it to staff as a complaint, sever OOC communication with the player, and if I find myself on a game where staff isn't handling complaints about logged abusive player behavior? I leave the game. Ultimately, if this results in me having zero games to play? I do something else with my time, because at that point I'll have more fun away from MU than with it.
But we should be very, very, very careful to not create an environment where cult of personality results in logless courts of public opinion, and I feel that there should be more awareness and action taken against people who use the sideways means to attack other players.
So, there are problem players (Stalking, Doxxing, Abuse, etc) and there are players who use logless whisper campaigns of such to attack other players who have upset them. There's a difference.