I don't understand why its all such an issue. I did what worked for us as a family and I just expect everyone else to do the same. I couldn't give a monkeys what they do (within reason of course) and I don't expect anyone to really care what I do.
FWIW DD1 was easy going and laid back. I put her in her cot and she slept. If she grizzled we'd settle her and she'd sleep, if that didn't work she'd come in with us and then she'd sleep, easy.
I thought because I was doing all the 'right' things I had a happy, confident, content baby who felt secure and happy to sleep.
Ha! How I laugh at my smug self now!
DD2 was a nightmare baby, reflux, colic, clingy, feeding problems, allergies and so on. Basically she was full on from day one, it was intense. We had help from all sorts of HCPs, I read every book I could find. I am a hippy at heart, washable nappies, slings (mei tai, woven, stetchy, ring - I have the lot) so my natural instict wasn't towards CC but nothing else worked with this baby. Nothing. Until we did CC, now she sleeps and we all benefit from this, most of all her as she became a different child once she was getting some sleep at night at last.
My point is this, sometimes CC is the only option left to parents who cannot continue to cope when the shush-pat method, the no-cry sleep solution, the co-sleep solution, basically-any-other-solution hasn't worked and they are desperate.
If I had not had DD2 I would probably still think that parents who CC just don't know the virtues of co-sleeping, breastfeeding, babywearing etc and that they just must not understand how a baby can be nurtured using these methods, to produce a confident, loving, secure and independent child.
But seriously, DD2 just didn't play ball and CC worked. And she slept.