The philosopher Mary Midgley tells us that myth is not just an obstacle to thought, or even merely an adjunct to thought, but an essential part of human ratiocination itself. Whether this is actually so or not in the philosophical sense, namely that human thought is completely impossible without the making and use of myth, I do not know; but what is certainly the case is that mythology is a powerful force in human affairs, not least in politics. And myth can do harm as well as good.
In Britain, the most powerful political mythology (perhaps for lack of any other) attaches to the National Health Service (NHS). This way of organising our health care was born with original virtue in 1948, since its conception, in more senses than one, it has become more and more immaculate. If the service had a slogan, it would be Noli me tangere. No British politician would dare admit that its institution was anything other than an unmixed blessing; no British politician, at any rate none who aspired to office, would dare do anything other than tinker with it at most. Against the mythology, Mrs Thatcher herself was as helpless as a day-old kitten.