correct me if I'm wrong but from the looks of the picture, if everyone would have started parking like intended after these meatheads did this it looks like they'd have been hanging out of the spots a bit but maybe traffic could still had gotten by and those rigs would have an interesting time to get out and nobody would have even had to touch their property. I think the point would have gotten across that way as well.
Trouble is those types are usually easily victimized at lash out feeling justified.