There's a difference between a government-enforced obligation and a moral one.

The latter has never worked at scale to remind the wealthy that they need to look after the societies which allowed them to create that wealth.

Sure, and a big part of the framing that Thatcher used was to emphasise the obligation of those that might need direct support from society, but ignores the obligations of those that have become wealthy from the implicit support. I think the point you are making, which I agree with, is that the obligations are required everywhere, and should be enforced if not forthcoming.