There are people who review all the facts, interpret them as they see fit, and decide that they don't need to wear a helmet. I can buy that, even if I disagree with it. For them the mindset is a lot like religion - they have faith they're making the right decision for them.
Then there are people who don't wear a helmet, without any consideration of the risks involved, because they want to look cool. Those people are friggin idiots. Those kind of people probably believe everything they see on the evening news, too. There's no reasoning with them.
