NonE, I respectfully suggest that you have it just backwards here. My body and life (and property) belong to me alone. It would not matter in the least if no other person on the planet agreed with that. They might well be able to take possession of it away from me, but that would in no way change the true ownership I hold unless I then relinquished it.

Self ownership - and the absolute responsibility that is the other side of the coin - is so vital to me that I would (and probably will) die to defend it, even if I were all alone.

And yes, it is just that simple. The core principles are always simple. For me that means non-aggression and self ownership. Everything else derives from those.

The application of those principles to all the millions of details in life can become complex, of course, but if one holds true to the core and measures every choice and situation against those principles, the answer - and right choice - is seldom any mystery.