Exactly like you said 'if its not your property dont touch' and i have always practiced this this myself as a basic courtesy but if someone goes out of their way to steal or damage anything that belongs to me, then they obviously dont abide by this basic rule and will get what they deserve, try to stop me. Why should they be afforded the luxury of respect if they dont have any themselves.
If you wanna sit on your ass and let people rip you off go for it but if you think the cops (authorities) are gonna do anything about a couple of $7 crab pots your a dope.
I had 8 good pots (over $400 worth of gear) knocked off a few years ago and i had a pretty good idea i knew who it was but the cops didn't want to know about it, so stick that in your goody 2 shoes pipe and smoke it.