Amor, I assume you are referring to your NHS? It looks like we might be heading in your direction, but I hope not. The position of far too many people is that the government (social workers, government health workers, etc.) knows best and always acts with the purest of motives. I strenuously disagree with that. You made this statement:
...society has some obligation to take modest measures to identify that evil.
If by "society" you mean a faceless government bureaucracy then I think you are wrong. But if by "society" you mean neighbors, family, and other people who may know the situation in question, then I would agree. A moral and civilized society cares for each other. When you pass off societal oblignations to a central bureaucracy, made up of people nobody knows, and that establishes it's own arbitrary rules for society to abide by, then you take away the freedom of self governance, something Americans (used to, at least) cherish. And eventually you get a society incapable of making decisions for itself, determining what's best for itself, and they will always be looking to the authorities for approval or living in fear that they are breaking some rule or another. To that kind of pathetic existance, I say, "No thank you."