I don't know that it's even conditional. I think we owe society something just anyway. If my neighbor's house is on fire, I should help how I can: contribute to putting out the fire (actually fighting the fire, calling someone who can), and I should help my neighbor deal with the aftermath (clothes and food and shelter and maybe assistance with paperwork, rebuilding, etc.).

So it's not transactional, but an underlying permanent obligation to other humans to at least do a baseline amount of good.