I find it rather amusing that you link an anecdotal example as an argument for wearing a helmet and are unconvinced by the same thing from a different point of view.

It's not hard to see that this topic is far from clear cut and is quite controversial. To have a balanced view of it is sadly lacking. I certainly got the impression that you'd said you'd be open to look at all sides of the issue and not just one. What other sites have you visited that may present some evidence that challenges the anecdotal information you've presented so far?