I've got a different take on this than most of you.
Some slob is reserving public property for his own use. They probably put the stand where it is because it is a good spot. Who knows when or if they will ever return yet all hunters are supposed to stay away?
If I found a stand where I wanted to hunt I'd be pissed if there was no one in it. If it was a place that I really wanted to hunt I might hunt there anyway, either in my own stand or on the ground. If the owner were to come in I would ask HIM to move, public land is first come first serve.
If the stand were there for an extended period of time I might even assist the state in removing abandoned illegal liter from the state's property.