twinkle, thanks for posting examples....you're gonna think I am splitting hairs, here, but none of the examples you give back up your original post at all.
The statements you quote are indeed generally true - it is true that, generally, breastfeeding takes some practice at first, and that, generally, once this has been done breastfeeding becomes easy. How that translates as 'it is your fault' if it doesn't work out comes from you, not the words. And it comes from you because breastfeeding is an emotional 'thing' - there is a ton of stuff from NCT that focusses in detail on specific problems, for those who need information and help about them.
It is also the case that breastfeeding gets off to a good start when the baby is fed day and night for as long as the baby wants - that's biology, not ideology. You will find NCT addresses the issues that arise from this - specifically, the need for a mother to have support and help in other areas of her life to make this frequent feeding possible.
It is also the case that the introduction of formula can lead to the end of breastfeeding - it does not say this is 'inevitable' but any formula makes this more likely. Mothers need to know this. There are often threads on Mumsnet outlining the way formula, introduced as a top up or supplement, starts to replace breastfeeding, leading to no breastfeeding at all. A current thread says 'no one told me this would happen and now I want to save my breastfeeding'. NCT has a factsheet called 'bottles for breastfed babies' which deals with this honestly, but also outlines how the risks of formula impacting on breastfeeding can be reduced.
I can't comment on 'many postings on Mumsnet' but these are not an official or published source of information - they're people's own individual experiences as well as people talking about things and sometimes getting them wrong
Your midwife is not speaking for all midwives. She's just reporting poor practice - totally ruling out nipple shields is just as bad as giving them to every mother who complains of difficulty latching or sore nipples.
You had a really difficult experience and you have mixed feelings about it - it's very hard for mothers who are having a bad time to read positive stuff about bf and yes, it can make them feel as if they are bad mothers.
I don't know the answer to that, really....it is surely not right to withhold information that could help people wanting to breastfeed in case someone else at a low point reads it. The good thing is that in time, most women stop feeling personally 'got at' and, like you, get the thing into perspective more clearly.