People used to see those and aspire to be like them and improve themselves. Something changed over the last decade or more, and now no one wants to do any better than they currently are. They are despairing in content with themselves.
People still aspire to be attractive they just don't feel the same social pressure to chase it that they used to. Personally I don't see the problem for the USA, if people are happy being unhealthy then let them be unhealthy. If this was Europe I could see a public cost argument but US businesses are already starting to charge more to people who are inconveniently obese so I don't see why it's a real concern.
They're not happy. They're suffering and helpless. That's the problem.