There is no state in the union where you can shoot people who are simply existing in your otherwise-unoccupied home, because "sleeping in a house you don't have permission to" is not an offense that requires any kind of violent defense. Even in castle-doctrine/stand-your-ground states where you don't have a duty to retreat, you still don't have a blank check to assault. Squatters are not home invaders, literally forcing people out of their own homes at gun point or some such. Otherwise, all a would-be murderer would need to do is plausibly lure their victim to their home, at some point say "I need you to leave", then shoot.
There's a million good arguments around American gun culture vs. European gun culture, but this is emphatically not one of them.