Here's the situation. You're standing on the deck of 25th floor and the deck caves in and you go down, down, down the building. Then you grab onto the 15th floor and now you're on the 15th floor and what you really want to do is go into the apartment and get onto the staircase and go up back to your party and not go out on the deck again. And there's a flag pole on the 15th floor and you're crawling down the flag pole and trying to get into this person's house. And this person comes out with a gun and says - "that's private property, you're a trespasser, get off. The issue is not what should you do. That's not a libertarian question. The libertarian question is - if that person shoots you for trespassing, are they a murderer? And my claim is that they're not.

Walter Block "Does Spanking Violate the Non-Aggression Principle?"