thats not what I'm suggesting at all. you missed it.

given all the full contact sports out there...someone is bound to hit at the exact angle, depth, point, etc

you said yourself if someone doesn't know what they are doing, then it's dangerous. well, many full-contact guys are not trained in DM, so wouldn't they be in the same danger of accidently hitting a point just right? we know that KO's happen, nearly all are caused when the brain is rattled in it's skull. somehow they manage to do that, but miss the DM ?