They won't be able to.

How does a wild animal feed his family if he can't catch any food? He gets out-competed by more effective individuals.

Given finite resources and unbounded population growth, population must grow to the point where there are not enough resources to support everybody, and then some people have to start dying.

As much as you'd like to invoke social Darwinism, maybe they are secretly lazy or whatever, but there is one underlying issue. We are a modern civilized society. As a society, we have an obligation to prepare our children for the future. "Let them starve" means I'm going to be killed in front of my son behind a theatre by someone who's parents were allowed to starve. The solution isn't to buy a house in a gated community and pretend like problems go away.

Ok. We'll just make sure to move them all next to you while this happens.