i mean it pretty much exists solely to retroactively justify/absolve themselves of genocide by asserting "homesteading" as the only valid basis for ownership, and of course private ownership as the only valid basis for control of labor, land, and resources.

so it's a bit like the divine right of kings, clearly a bunch of bullshit that only exists to justify absolutist monarchy. it doesn't really have to be internally consistent, people with a strong enough incentive are still going to convince themselves that some people have magical sperm.