We had that problem around here for a while. It is crazy because we hunt daily on our land, and work daily on our land. Over 500 head of cattle we milk. The guy doing it we finally caught. Our stands here are the Skyscraper tree stands, total of about 25 foot in the air to shooting rail. We unscrewed the platform on a few. I guess when he went up to get the strap off the one and stepped on the platform, ooops! We found him banged up the next morning by the stand.
We have not had any more trouble since that incident. I guess word got around...