>  if your baby isn't sleeping then you're obviously still doing it wrong, you're a bad parent, it's all your fault.

I would strongly hope that parents would draw the conclusion that the book is wrong. With so many contradictory books, some are bound to be wrong, so if a book doesn't work, it must be one of the wrong ones. Try another one to see if it works, or maybe try your own ideas and see if those work.

Parenting is mostly experimentation.