Jools, you ask (some way down thread) people to accept that some mothers don't want to breastfeed, even though they know it's the best.
Seems you are exasperated: you feel that some breastfeeding supporters think that merely repeating the fact that formula feeding has health risks will convince these mothers to change their minds.
I think it's fair to say that sticking to the facts is sometimes enlightenng to people, especially those new to the issues. There are people who genuinely don't know the facts, and can then weigh these againist their personal preferences.
For some women, their pesonal preferences will win out, partly (at least) because they do not accept that the documented health risks may apply to them - and of course they may well be right, because we can't 'bet' on which risks our own family may succumb to. It's also true that in the west, at least, a lot of the 'everyday' risks of formula feeding (increased gastro-intestinal illness, ear infections, chest infections), while miserable, are not life-threatening or serious. Even the rather more serious risks, such as diabetes, are manageable in the west, and anyway unusual enough to make it easier to assume it won't happen. The other very serious risks are very rare, and anyway, because it is not 'cause and effect' but balance of risk, and because there are other factors involved, these risks are not likely to weigh strongly, unless you have had (say) Chron's disease (to pick just one of these) in the family and know what it can mean.
People (on the whole) don't make decisions based on some sort of actuarial calculation, and when it comes to infant feeding, the personal is likely to weigh very strongly.
That's why it makes no sense to bang on and on abut health factors in campaigns to increase the nos. of women breastfeeding. Far more effective would be practical measures to improve training among health professionals and education to help the women who want to do it, to have a good experience.
The women who actively want to formula feed should get decent help and information, too, but this is likely to be hard with formula manufacturers in competition with each other and with breastfeeding.