I already have. I get over it. There's no point shortening my life stressing about what other penarses do. Do all you can to proactively avoid the situation occurring ie by parking as far away as you can. I would almost wager the fact that parking over 2 spaces you are far more likely to get you door keyed deliberately than accidentally, or you'll end up on that **** poor Parking facebook group mostly populated by Mercs and Porsches.
Society unfortunately is circling the drain. People don't give 2 ****s about anyone else's property anymore, as has been said above it's a civil matter rather than criminal if damage occurs in most private car parks. There is nothing realistically you can do unless you are lucky enough to be able to throw money away on a lawyer for such a matter and have hard evidence. I, like most normal people don't which I guess is why I'm writing this reply in the A4 subforum as opposed to the RS4 subforum.
Don't get me wrong, I regularly get proven wrong and random acts of kindness do restore my faith in humanity every now and again. Also I do take pride in the appearance of my own car, and do detest the state of affairs we appear to be in, hence I do everything in my power to avoid getting my car damaged by other twunts. However, it still happens and maybe I've been lucky not to have any serious damage done in that respect I've lost count of the new marks I have found on my cars over the years from ****** car parks.
Actually someone reversed into my car whilst I was stood next to it. I got their details and such like, but when I got some quotes for repair I realised all car repair places take the royal ****. So I tried polishing it out and lo and behold all the paint from his car came off leaving a couple of creases in the rear arch. One quote was for £350. I had the chaps insurance details but you know what, for the risk of the repairer doing a bodge job (I've seen far too many red re-sprayed panels fade to pink over the years) I've decided not to pursue it and chalk it up. I'd rather live with the crease than risk the repair even if someone else is paying. In the end though, life's too short to stress it.