It's a simple message. People just don't care about anybody but themselves. Has anything changed in the 2,758 years since Amos lived. Israel was a properous nation. But as so often happens, the prosperity didn't reach everybody.
Some people always fall through the cracks.
Those are the people we want to talk about. They are the lost people in our society. They are single mothers and their children. They are unwanted or abused children. They are farmers losing their land.