My friend, it isn't a sense of justice, but more of respect for the players. Accusations that may not have any truth to them can discredit a person, despite the fact they have not done anything wrong.
Although, in a game of Epic Mafia, I'd be inclined to agree with you. On the lobbies and on profiles though... perhaps not!
I know a few of them, and I am certain their integrity is not to be doubted. Although I cannot speak for the rest of them, I believe it's safer to assume they aren't, until there is proof that they are.