"No amount of government or lactivist propaganda would have made me any more or less likely to choose this path."
With all due respect, you're just one person, though.
I am breastfeeding my second (she's nearly 1 months old, fed DS until he was 13 months), and was always going to a). because my Mum b/fed us and so it seems nothing more than normal to me and b). because I'm your stereotypical middle class, older, educated mother.
But there are loads and loads and loads of women out there who don't fit into either of those categories, who may well be persuaded one way or another. Whether this is the way to do it necessarily, is obviously up for debate - but to say that since you yourself had (as I did) your mind firmly made up, then everyone else will have as well, is crazy. Hmm, you're living up to your name today. 
If that's the case, then the advertising and marketing industries would no longer exist, would they? If people can't be persuaded from one way of thinking to another; from one brand to another, then how come we live in the consumer, brand-driven, aspirational-for-the-next-'in'-thing society that we do?
And formula will always have this edge, since it is a multi-million-pound product which can be marketed and sold and profited from, whereas breast milk is free and produced by Mums.
I do agree though, the 'breast is best' is a useless and totally unhelpful campaign and slogan.