I can't stand the constant random player killing! I mean if there was only a little or a higher risk of punishment for player killing I'd be fine ie. if you PK and get killed by the cops as a result you lose more money or the cops might even put a reward on your head.
Other that that maybe hostile and friendly servers where there rewards and punishments for PK-ing respectively.
But for now i will still be that guy who tries to be friends by parking next to you and honking and if my friend get killed sh*t will hit the fan.