Let's look at utility.
Morally, natural rights (I have an inviolate claim on my, and no one else's, life, liberty, and property) establishes what is permissible between and among men. The utility is obvious. You are in the wrong if you kill me (without just cause), or slave me, or rape me, or steal from me, or swindle me. Like it or not, the idea that my life, liberty, and property are mine (as your life, liberty, and property are yours) is foundational to what is erroneously called
democracy or
democratic society.
As aside: the whole push to frame things as
democracy or democratic is a ploy to degenerate natural rights, to make your claim to your life contingent on what others allow. It's a scam meant to reduce you and me and him and her to cogs in a machine.
Simply: if a man has no right to himself then he is a
commodity to be used by the powerful and their agents. And if he has no right to himself then he has no true objections to offer about being used as a commodity.
Finally, I believe I am a person, that I do, as fact, have an inalienable right to my, and no other's, life, liberty, and property. And I believe the same about you, that you are
yours. But, even if I'm wrong and
have only dreamed, or made up, all those things...Then all I can say is that, in that case, the made-up things seem a good deal more important than the real one. Suppose this black pit of a kingdom...is the only world. Well, it strikes me as a pretty poor one. And that’s a funny thing, when you come to think of it. (I may be only) making up a game...but playing a game can make a play-world which licks your real world hollow. That’s why I’m going to stand by the play-world. I’m on Aslan’s side even if there isn’t any Aslan to lead it. I’m going to live as like a Narnian as I can even if there isn’t any Narnia. the last bit is Lewis's, hacked up a bit by me