it's funny to read this today as just the other day I was reading an article about the difference between controlled crying and cry it out.
It makes sense to me that you may need to do a little controlled crying with your baby to teach him how to sleep at night. Just like he might need a little controlled crying when he wants sweets and he can't have them. Or when he wants to climb the stairs alone but it's not safe.
To me, controlled crying means allowing baby to have a whinge because he's not happy about the boundaries we (parents) are setting. But if he is becoming distressed, we settle him, and then start again.
That's different to saying night night and then leaving your baby to cry for hours in a dark room, alone.
I got a lot of baby sleep advice from a baby sleep forum. It was all free and there was no-one saying you should do it this way or that way,only what works for me and my baby.