We are raising a kid with some mental deficiencies. (I suppose anyone raising a teenager feels this way at times.) Depends on what his issues are and how his parents handle them. Some kids truly cannot be held responsible when they do such things. Others can. Not enough info to draw a conclusion, but getting to know his parents might be a good idea. If you are thinking of shooting on your property, is the kid going to wander through? If things come up missing very often, will you still feel bad?
Keep an eye open. You are a good dude Al. You may be able to be a positive influence on his life. Glad you got your camera back.