Since we're not talking about somebody adrift in interstellar space, your argument makes less sense. Instead you have to argue some variant on a) not everybody deserves a reasonably safe job, or b) people do deserve that but we as a society can't afford it.
(I don't think either of those is true, but at least they'd make sense.)
Even having a society does not make wonders: we don't have a cure for cancer, we don't have a vaccine for Covid, having a functional society does not mean you can obtain everything, including safe jobs and decent lives, especially when the definitions of safe and decent are moving targets: versus 200 years ago we are living an utopia of safe jobs and decent lives. Just think logical, not only emotional.
I think that's wrong. We of course can't afford everything, and I never said otherwise. But what we're talking about is "a safe (as possible) job". There's no particular reason to think that if Amazon takes proper worker safety precautions, suddenly they'll be out of business. Might Bezos be marginally less rich? Sure. Might Amazon customers pay a smidgen more? Sure. Will society collapse? No. Will some other workers suddenly not have a safe workplace? Also no.
We can afford it.
I don't care about how rich is Bezos, it is not my problem (or, more exactly, not a problem for me), but the blanket statements like "everyone deserves X" and "we can afford Y" are a problem: we don't simply deserve and we cannot afford most things.
But would it not be nice if it were society, us humans, who would provide the right to a safe job and dignified life?
That's not an argument against a safety net, just the opposing force that makes the correct (and possible) solution somewhere in between [UBI, euthanization), and different for each grouping of people.