Funny because I have been dealing with something similar in my neighborhood. First let me reflect on what I would do in your case; Being that the teacher basically did jack about it, I would go above them, their supervisor, principal, camp director, whatever it is. I personally have no problem going above someone to ensure the job is done correctly. The fact is if you had addressed the child directly to issue corrective discussion, or anything else, you'd be in jail right now. The parents would sue you for harrasment as I am sure everyone now a days would do. Or file some stupid charge etc. In the old days, even when I was a kid 25 yrs ago, it wasn't like this, I know parents would have corrected me in a heartbeat, then my parents would have let me have it. For the record I was never smacked, etc. and only grounded once in my life. In my case, I have a pine tree in my yard, a good 15 feet from the corner of the curve/sidewalk corner. Well the issue is this is the bus stop corner and the kids were climbing in my tree, taking branches off of it and using them as toys etc. 1)This makes me liable for any injuries and I sure don't want my HOI to be all over me for some other little a$$hole kid. 2)They ripped off some large branches and my tree started to sapp pretty bad and I was afraid of it dying. 3)They were cutting through my yard, I was NEVER allowed to walk in anyones yard, drive, nothing. My parents would rip my a$$ all the time if I did, which I didnt. So becuase I knew if I addressed the kids, they would tell their parents who would in turn come after me etc. I called the school directly and talked to the schools principal along with the transportation director so that the kids parents were made aware and it was addressed at school with letters sent home. I don't have a problem with this, I don't care if parents hate me, I care about my property, and care about the little kids not getting hurt. I also built a large 8x8 mulch bed around it with landscape timbers so that they understand not to enter it. So far no problems, no eggings, no toilet paper, etc. Might help I have a huge K9 looking sheppard/chow mix that I walk through the neighborhood twice a day, all black with only white teeth, and not freindly.