Scientist have discovered that....
People will believe anything when you say 'Scientists have discovered ....'
HAHAHAHA
I think that probably as with ANYTHING that it is subject to interpretation and that judgement probably is an end result of that interpretation. I for instance have a VERY different idea of what "CC" is vs "CIO" -- One is absolutely more acceptable to me than the other... based purely on my understanding / interpretation / definition of them both. They are NOT the same thing at all in my mind.
Also open to interpretation is what each mother considers "Leaving the baby to cry" is ....what does "crying" mean in this instance? Mild fussing? Hysterical tantrums? Where do you draw the line exactly? One mother's understanding of leaving the baby to "cry" may drastically differ from another mother's... and that's where it gets really tricky and problematic. One mother may think its "hysterical tantrums" and that is absolutely unacceptable (And I'd agree) -- Another mother may think leaving the baby to "cry" means leaving it when its mildly fussing and think its absolutely acceptable (Again, I'd probably agree depending entirely on the age) ...now you've got two mom's, both of whom probably agree more than they realize, one saying "Its fine" and another one saying "Its not fine" and they're basing their statements off an entirely different definition or understanding of what "CIO" is.
For me and my baby girl, CIO currently is not for us. For one I strongly feel she is far too young. Even when I have to go pee right now if she starts to fuss, the crying escalates to near hysterics by the time I'm done and can get to her... because she cries, that's her only method of communication and she is laying there, she can't move, she can't get up and look for me, she has no idea where I am, she has no idea if I'm coming back, yes its very stressful for her! I try to keep her at least within earshot so I can talk to her, but words are not the same as a cuddle.
I'm open minded enough though that I am not going to "write it off" entirely as something that I may end up using in the future. If I do, it will be an absolute last resort, because I would really like to try alternative methods first. This is another area where people get touchy... I'm willing to bet there's a lot of mums who say "CIO worked for us" -- When they say that it doesn't mean they didn't try anything else first. Maybe it was a last resort for them too.