Arguing this is as pointless as arguing religion or politics. Or global warning. People will cite the studies that favor their position, and you're not changing any minds. Not too long ago, there was an internet argument for weeks over whether the correct answer to a 5th grade arithmetic problem on order of operations was 2 or 288.
I wear a helmet. I don't know whether it will save my life. But until someone convinces me that it's more dangerous to wear one than go without, I'll keep on wearing it. I know it's saved me a couple of nasty lumps on my noggin, and those hurt for days.