Without a layer of social construction, it's just the use of dominating force, an exercise of power. If you want to argue that is how the world works, that's fine, but you are demanding that other people justify their social constructions and then assuming that your social constructions are not social constructions.

It's natural for me to defend my property with lethal force. (Consider how many animals will do the same thing, if another animal tries to take their food or mate away.) Consequently, assuming it's your position that I should not be allowed to do that, you have to pass a law and use force to stop me.

That means that yes, you're the one who gets to justify your unnatural (but still potentially optimal) point of view. Exactly why are we better off if we strive to remove the personal safety risk from criminal acts? It seems that we're starting to see the results play out in real time -- ask anyone who was shopping at the Nordstrom's in Walnut Creek the other day, for instance.

Does that mean I'd be inclined to shoot someone for stealing the catalytic converter from my car, parked at curbside on a public street? Honestly, I can't see myself doing that, because according to my personal values that would be a pretty sociopathic thing to do. But I'm also not inclined to interfere if someone else wants to do that. The recent trend towards de-policing and non-prosecution of property crimes will certainly lead to more instances of this kind of dilemma playing out on the street. If law enforcement won't act, you can't be too surprised when individual citizens do.