In the case of someone who can't work for one reason or another there's obviously an exception because that's not something they can help

Children do contribute to society by getting an education and having a childhood to develop into well adjusted adults who contribute later on,

Unemployment benefits presumably are for people actively searching for a job

The elderly have already contributed more than their fair share raising their children

Using the phrasing people who don't work implies including people who are able but just don't want to