As always, voting against an RNG vote. As dawn stated, a mafia will just save himself, and if we force the RNG vote to go through whatever comes, we can just as well kill a useful role, and are still much more likely to hurt ourself. Not to mention that the person to be targetted dies for nothing and the game goes by RNG instead of skill or anything the like, which hurts the fun and is against the spirit of mafia.
I am playing mafia here only since 50, but everytime a Day1-Lynch happened, it hurt town. Other people with more experience may collect their experience here, if they want.
Another thing I am more favouring is voting on players who don't say much, to push activity and prevent mafia from simply hiding as long as they aren't targetted (by roles or votes). At the moment, we cannot really state who is talking actively or not, though.