I wonder why we all think as we do about helmets? What influenced us?
Many people, I imagine, initially thought that helmets would make you safer. They are intended as a safety measure. Blows to the head might well be reduced. At first sight they are a good idea. Then you read a few arguments and statistics and find that the evidence surprisingly points in the counter intuitive direction.
Now if you're like me, who just loves to have a bit of surprising truth tucked up my sleeve, this is great. I'm like this in other areas of life, too. I just love all things counter-intuitive, and I love telling them to people. They are not always quite as delighted as I am.
Other people put a high emphasis on authority. If something is said by someone 'official' they prefer to accept it. Because many legislatures and regulatory bodies are in favour of helmets, they are inclined to follow suit. There are voices on both sides of the debate, so they choose by deciding which voices seem more reputable. This isn't an easy judgement to make, but politicians, newspapers and public opinion all point to wearing helmets. Not only may helmets make you safer, but siding with the majority and with the high status voices is the 'safer' stance in this confusing debate.
So I'm suggesting that character traits dispose us towards pro and anti positions. Broadly, conformism versus rebellion.
What I'm a bit more intrigued by is the large number of people who will say they are certain their helmet saved their life. Why the claim to certainty? It is often made rather aggressively. They may resent anyone who questions it. They were there. They alone know what happened. Their experience is not offered as a particular anecdotal bit of evidence, but as something that, for them at least, closes the debate down. 'And that is why I always wear a helmet and make sure everyone in my family does, too.'