I'll turn it around and ask you the same question I asked before. If you see a guy poach a deer in the backcountry, are you going to attempt to detain him at gunpoint? If you see a drunk driver on the road, are you going to give chase and tell him to pull over?
No, you're going to call LE and let them do their job.
Smoke:
Good point. So the people that saddlesore mentioned who took stuff from someone's camp are thieves. Even if they notified LEOs later. Right?
KC