Yes, it certainly is interesting when you open your eyes. It's actually really quite difficult to look at it objectively, due to, as you say, the hyperbole, marketing etc, which I guess really does have the effect of brainwashing.
Certainly wearing a helmet seems to give a reassurance, or comfort factor, and I can buy into the idea that this, in itself is a danger (as a comparison I believe it's been proven that people drive more cautiously when not wearing seat belts).
I think my position has changed to accepting that helmet use may well be unnecessary. So far though, I'm not sure I can buy the jump to believing that it can be actively counter productive, at least in terms of safety. I'm not really convinced that it affects people perception of danger in terms of whether or not they would ride either. I may be wrong of course, it just feels to me, like we tend to believe that the roads are more dangerous than they are. For myself, I looked at the statistics, and compared them with when I was a kid, and certainly deaths overall on the road, had fallen by 75%. I did not find statistics which related specifically to cyclists.