I did not say anything in contrary did I? OC can go wrong as quicly can CCR. However CCR is more complicated so more things can go wrong. That's all I'am saying. Check and double check everything all the time, don't assume anything.As you said, whats between your ears can make you safe or unsafe, but it is a confirmed fact that CCR's are MUCH less forgiving than OC, vis a vis more 'dangerous'.
My problem with a lot of divers is they trust computers, diving operators, instructors, buddy's and so on to get home safe. In my mind this is unwise behaviour and you never should trust anyone or anything when it comes to your own safety. Safety to me means you have checked your gasses, equipment, buddy and dive plan. OC or CCR does not matter to me, except with CCR you have to be even more vigilant than OC because of higher complexity.
But does that mean it's more dangerous? That depends on how you define 'danger'.