I look at it this way.
A) If I was hunting private land and was the only one with permission I would use the stand b/c the owner doesn't have the right to be there.
B) If I had permission, along with several others, whom I did not know very well, I would not use it unless I the owner said I could or I asked permission.
Now public land is another set of rules.
A) If have hunted the public land several times and never saw activity there, I would eventually use the stand.
B) If the owner came along I would leave the stand. I would also remind him/her that this stand is illegal.
C) Which brings me to final point. I personally don't care if a stand is on public land. I would not put one up on public land but if there is one up... in my opinion... anyone has the right to use it.