Some people don't believe in the cry it out sleep training method here - what's the thinking here?

I also don't believe in the cry it out sleep training method too. Same as Jamie, I think in the long run, babies will grow up to be insecure, inconfident and may affect the development. To add on, I came across this article on why babies in orphanage don't cry. http://www.ijreview.com/2016/04/575865-man-asks-why-100-babies-in-an-orphanage-arent-crying-the-answer-will-haunt-her-forever/ The answer just make me feel sad for these babies. If we allow our babies to also cry to sleep, yes, they may eventually learn to be quiet and sleep. But how different are they from these poor orphans?