What about banning false accusations? (No need to list accusations of lying, whining, etc., just ban false accusations. Bonus perk: I can accuse people of lying if I can prove it.)
That's a thought. Worth considering. Thanks for the suggestion!
Of course, the obvious question is, how does one determine if someone is lying -- as opposed to simply misinformed, ignorant, or mistaken?
I think in practice most sensible people can figure that out with a reasonably chance of being correct when given enough data to work with. i.e. hard to tell if someone is lying when you only have a few examples. But much easier when you have many.
Now, here's the complication: Banning false accusations (as opposed to all accusations) presents a challenge to moderators. Just how reasonable is it to demand that they have gathered enough data about someone so as to know with reasonable odds of being correct that the person is lying?
Still, there might be a way. I'll keep thinking about it.