Earlier quoted context omitted.
> Fairness is not about everyone getting the same amount just for existing, for that in itself is not fair. Can you explain why? And if your answer amounts to "because people provide different amounts of [effort|value] to society" how would you reply to "so what?".
because the stuff they get for existing has to come from someone else.
> because the stuff they get for existing has to come from someone else.
Your statement doesn't hold unless we assume "it is unfair for one person to provide for the needs of another (unless it is reciprocated)", and it isn't at all clear that we can take that axiomatically.
Even setting to one side the more obvious cases of parents providing for children etc., if we were to assume that one person could, through their labour, provide for the needs of everyone else, why does it obviously follow that it is "unfair" for everyone to survive solely that person's labour?
More generally, it really isn't clear to me that these questions have such simplistic answers.