Mafia: general discussions.

Well, the issue isn't even about the punishment itself. Players should understand that they shouldn't do things like that, otherwise, what's the point of having rules at all?
It's a shame that it doesn't work out normally, and we have to resort to such methods.

if a player receives 3 warnings from a GM, they get a modkill...

It can be two, or even one warning...

I won't impose my point of view here; it's best left to the GM's discretion.