How old are the people that did this, a factor to figure in.
If teens then forget them go for the parents, they may get the message to control their kids in a way nothing else helps.
Lets see, find out where the parents work and slap on a bumper sticker reading, " A proud member of MBLA, send us your boys
."Take out a one week add in the local paper stating a time and date for the local MBLA meeting using their address.
Get a letter printed, addressed to the Father that says that if he cannot control his kids, more is to come and send it FedEx with return address of Bill Aryes. SIGNED FOR.
These may be great parents that have no idea what kind of Hooliganism the kids may be into so tread carefully.
If these are kids the object is to get the parents FULL attention. If the parents are the kind of folk that think that busting up a snow man on private property is no big deal, then you have kids in the making that think nothing of trashing public or private property by whim.
When Parents are subject to kids that paint Giraffe, break windows and run amok, most parents will cry they had no idea what the kids were doing and get in a huff when anyone asked them about this. I cannot control my child they say, but when it comes to their being placed in a bad spot, be sure they will try .
To be fair to the parents and stop their monsters who are to them "good Kids" give them some of their own inside knowledge as to what their own "good kids" are doing to others.
I wonder what a mother who has a son that deals drugs out of her home and says she cannot stop this activities would do if every day she found her front and back doors blocked by dog, human and cat shit with a sign in the middle with her child's name on it. Bet that activity stops on second day.