Well let me simplify: do people owe any obligation to their society? If so, to what extent would you offer as a reasonable thing? If not, why?
Oh, I don't have anything against people contributing to society, but *everyone* needs to contribute. The general idea I'm feeling from you is that regardless of whether 'poor people' contribute any effort to society's good, 'rich people' should be forced to contribute anyway. Is that a fair statement? You only see a one-sided obligation?