If society will entitle me to go out and take anything I need or kill any animal I see, you'd have a point. The social contract of "private property" is only equitable between the rich and poor if there is some counteracting element in society that prevents people from suffering from the things they would be able to take on their own in the lack.

Further, there's a sort of problem when you compare present society with past society. We've been working for thousands of years to make each generation live better than the last. Hunger, especially childhood hunger, should hit zero by now.