Mobs and justice don't tend to mix.
I joined a new guild, and everything was great. People were happy and talkative, they were doing things together, and the guild leader had made it clear people could approach him if they had a problem with his leadership and he would step down if they thought someone would be better.
This lasted all of about 2 days after I joined. I came home and was immediately pulled into a conversation where I was told the leader was sexually harassing female members, sending them creepy messages and making them feel unsafe. This was serious, and the first thing I asked was did anyone bring this to him. I got a vague 'he was told' and no more information, so I accepted what they were telling me. They initiated a public vote on the forums to have him removed from the guild, after telling everyone unaware about it (before giving them a chance to hear the leader's side) and expected us to vote based on that.