It is sad. And most of it is from the younger generation. I'm not saying they are all slobs but a large percentage of them have zero respect for others or the land. Us older folk would never even think of stealing a trail cam if they came across on in the woods. But today when you put one out on public land you keep your fingers crossed that it's there when you go to get it.
Last year however I had one gentleman put his beer can in front of my camera so it could take a pic of it. It was pretty funny and at least he didn't steal it. BTW I shot a buck out of the stand in that spot too.