This is racing - trying to get back to the roots. First of all, people need to stay in the dang seat and not up against the fence. Second of all, swapping paint is part of racing, it isnt the other persons fault how the other driver handles the car or how the car turns.
Now, with that being said... There should be some rules against going out there trying to hurt someone - but this is racing... Rub the paint, get out the frustrations on the track and race!
If you want a pansy sport - stick with baseball!