R you sure that it was kids that did it? I know plenty of adults that would back stab people and take stands. It also might be some anti hunters in your area.
I take down my stands every year for the last few years becuase we have been havin trouble with poachers and afraid they will take our stands. If your brave enuogh you can get a trail camera and set it up close to a stand. When they come to get the stand you will have them on film. Just hide the camera so they wont see it. Thats how we caught Trespassers on our land