The relevant point is that the illegality of those actions themselves only help if you manage to catch someone in the act during the few moments they're perform

The relevant point is that the illegality of those actions themselves only help if you manage to catch someone in the act during the few moments they're performing them. Vs trespassing when you can exclude people with alarmed fences and can catch them during the prolonged period when they're on your property, even preventing them from getting sight of whatever they might choose to steal or vandalize... it's an orders of magnitude difference in costs and effectiveness. > Good thing is that it anyone is hurt in this scenario it's the idiot. Why worry about it? Because they can sue. Often successfully, but even where they would not ultimately be successful they can cause enough costs to extort you for a settlement.