Armic

You said it's "certainly not possible to do so" so I'm curious as to what counts by your view. The way you said it implies that other people must necessarily reach a conclusion that largely agrees with you.

What counts as morally legitimate?

Inequality by itself doesn't cause bad safety. the following countries have a higher share of wealth controlled by the top 10% than vietnam and also a lower homicide rate: singapore, uae, switzerland, sweden, qatar. that's just off a very quick search i'm sure there are more. Certainly in none of those countries are people hunkering down in private fortified castles for fear of stepping out in public.

Easy practical definition: something you couldn't make in your own kitchen no matter how good of a chef you were. eg you could can beans, you couldn't make a poptart.