Uhh. So if I left my Lexus in downtown Detroit with the doors unlocked and left it there for a few days, to come back to it being either totally stripped down or missing all together, that is somehow "their" fault?
If you leave something unattended in an area that anyone, even a 2 year old, would know get damaged by an animal or person, I would say it's more your fault than it is theirs.
Furthermore.. the raccoon was looking for food and shelter, a basic need of any animal, including humans. A raccoon does not say to itself.. hey check out this jackass's house/trailer, lets go trash it... if you believe that.. then well.. there's no debate to be had.
P.S. when I say "you", I am not referring to you specifically, I am using "you" in general terms.