I think it definitely applies to society, especially since the current society is very capitalistic.
Basically, those, who are "weak" (either by being born with illnesses, or some accident happened, really in any way), don't contribute to the society, therefore, the society dislikes them, thinks of them as a pest, etc. If you're not "useful" to the society in one way or another, most people don't care about you - just think of addicts living on the streets. Sure, they may have been important when they weren't addicts and contributed to the society, but now? Nobody cares, and most people are disgusted by them, solely because they cannot take care of themselves in a way that wouldn't be seen as animalistic, basically, homeless people don't hold up to their standards, and so they're "naturally" left behind. It's sad really.