My DH told me he believed in CC while I was pg. Then he saw Niece being "control"-cried: there is nothing controlled about it. It is watching a baby scream and turn red and have her breathing go funny. He told me on the way home there's no way we are doing that to our children. So I was lucky in that respect. He's not great at comforting DS, but he will hold him while he cries.

The Science of Parenting (as already recommended) is fab as it shows MRI scans of the brain damage done by CC methods.

BTW, historically a baby's cry is geared to attract predators. That's why parents don't let baby cry: they want to keep baby safe and a crying baby isn't safe.