This is why I hate things like this the war our society is now. To fix a simple problem like this, assuming they aren't willing to do it themselves (and way too many people aren't) you have to go thought a tremendous amount of time and trouble, get the legal system involved, spend more money then it's worth fixing the problem and probably spend more money than any damage caused in the first place and go though a big hassle. This is all assuming that the local authorities are willing to even take the time to do anything about it.
This reminds me of a situation I know with somebody that had a problem with a neighbor’s dog coming in the yard. Here your not allowed to do anything to the dog when you catch them there. Technically your supposed to call the local animal control officers, which the majority of the days they aren't working because of budget concerns, and even then they don't work that many hours. Assuming your lucky enough to have them working that day they come out hours later, when the dog will be long gone and they still can't do anything about it unless you can prove the dog was there somehow, which is impossible most of the time. Of course they went and talked to the owner who just has to lie about the situation so they still won’t be able to do anything about it. So on and on it went for months until they moved out. Short of buying a video camera, which he didn’t have the money for, there wasn't anything he could do. It was a different but similar situation than this but in another incident somebody just got feed up and shot the dog. I think it took the authorities a whole day to come out and charge him and give him a court date which he went to jail for and was heavily fined. It even made the local news. So I guess what I'm trying to get at is we live in a society that will protect the imbeciles of the world but do nothing for you and will even come after you when you don't go through the extraordinary and costly efforts they expect of you to fix the problem.
I like the old way like when my dad was growing up where people would get their asses kicked because of the way they acted and when they didn’t take responsibility. (in this case they still wouldn't have messed with the kids, but they would the parents who were responsible for them) The authorities would look the other way and if they didn’t they were more willing to help you resolve it in a timely matter. All your neighbors would come out and clap for you, assuming they didn't help you beat them also. It was simple, fast, cheap, and it worked, problem solved. I guess we just live in a "better" and "advanced" society now.