There's a fine line with all laws when it comes to enforcement. Take radar traps for example. They're usually set up on 2 lane roads where the speed limit is 40, yet most do 50 because that's what it "feels" like. Are these people horrible, are they going to kill someone? No, yet the cops write tickets to make money for the city. When they over do this kind of crap people get pissed and move somewhere else.
Just happened to turn on cops tonight and watch the last segment. The show is now done by actors, so it's fake, but I watched it anyway. Cop pulls someone over, says they cut someone off and were speeding. Person is acting nervous. Cop asks if anything is in the car, person says no, objects to a search. Cop calls for a dog. Person confesses some weed is in the car. Cop says that's ok, it could only be a ticket. Person keeps talking, back up arrives, person is arrested. See, the cop LIED to get a confession by telling the person it was only going to be a ticket if he cooperated. Don't talk to cops.
And to everyone laughing at me, you'll eventually get screwed by the system no matter how hard you try to avoid it. What really surprises me is how long these trespass warnings have been going on, because I had never heard about it until it happened to me. That means most people are to embarrassed to speak up about it.