I think there’s data that could provide a powerful counter to this proposal.
Talk to your LEO‘s,wardens, etc about times that people have been told they were trespassing by someone when they were actually not. In every one of those situations, this law would be needlessly providing a venue for escalation in which nobody wins. Even if the trespassing was actually occurring, this law encourages escalation.
Imagine you’re not trespassing but someone accuses you of it - a situation I have personally been in that ended with me calling their bluff, “go ahead and call the authorities and we will see how it pans out”. They did not call the authorities. But I imagine what that would have been like, if that individual thought they had a free pass to get physical with me.
Deep in our in animal brains we know, people don’t get to put hands on you with impunity. We often begrudgingly accept this with LEOs, but if John Q Landowner comes at citizens with physical force regardless of the situation, folks with weapons would be reacting accordingly.