The comments that have disturbed people the most have been direct quotes from Julia herself, in extracts from the book, or from complete interviews on WH, or her blog itself. I think some of the journalism, DT in particular, has been distasteful, but it's hard to dispute Julia's own words. Her descriptions of Immie as "an animal... a rag doll..."
"She now has another sister, Beatrice, who is the lively, challenging companion we hoped Immie would be".
"How long would it take for her to show that she loved me as I loved her?"
"I have accepted that Immie is as she is; I take her to music therapy sessions; I visit her when she stays at the local children's hospice. Now that she smiles, I can smile too, but I cannot celebrate her in the way I celebrate my other children. Always beneath the surface of my love is the black hole of that scan.
It is these words, and many more, that have caused this - nobody, in roughly 600 posts has condemned her for not coping. It is the clear indication that she is, in your words jonkat, "revolted" by her child. I think that has appalled all of us, whether parents of sn children or not, and that she has written a book which appears to consider that attitude acceptable, even brave, is abhorrent.