alt Hacker NewsAmerica = literally the whole world and everyone in it so QED inalienable rights exist
Well I wouldn't call it a strong argument...
Nonetheless the goalposts were never shifted. The question was always 'should'. So I'm very confused by your confusion.
What proof, exactly, would you accept for "should"?
Should is an opinion. You're welcome to feel "slavery should be legal". I'm welcome to (and should) think you're insane for holding that opinion.