Not saying the chalk thing is or isn't respectable, wrong or right. But ... When I was a Boy Scout and until this day we were taught to leave your campsite better than you found it. Fire pit cleaned and put out, campsite trash removed, and everything where it belonged.
Kids and things they do are often used to drive a wedge in today's society. Personally if it were my kids. They would have all the fun they wanted within boundaries. They would have been expected to clean the site before we left. And if that wasn't possible it would never have happened to begin with.