> There is no doubt that the survey is very biased in terms of the ratios of respondents between always, sometimes and never - a glance at any sport crag will tell us that.
Which sport crag will you glance at? A loose, choosy quarry of mainly F4-F6a filled with instructed groups will tell you a different picture from, say, the Grande Grotte. It's tempting to think about the crags *you* frequent most and perceive that as close to the norm, unless you make a deliberate effort not to.
> My sense is that it reveals some information about what people say about why they do what they do. I am much more sceptical that what people do is actually due to the reasons they give.
Agreed.
I'm astonished that 'because it's uncool' was the least common reason given for not wearing a helmet, and I'm fairly confident that a lot of people are lying to themselves, and to your survey, about their reasons. Can't prove it though! Maybe it's like when your GP asks you how many units of alcohol you drink per week. You give your answer and s/he doubles it.
I wear a helmet almost always when climbing, mainly because I can't think of a good enough reason not to. I would also feel a bit silly explaining to my mum why I had a head injury that might have been prevented by the helmet sitting on top of my rucksack. Strangely, I don't wear one while skiing. Go figure. I think it's because they weren't common when I started, but I'm now in a
minority.
That led me to another thought. Age. I guess there is a strong correlation between age, and helmet usage. The climbers I know who don't wear helmets tend to be older. (They're also the ones who are happier to drink-drive.)
I remember being at a sport crag once when a guy turned up to take some photos for a new guide. I was going to lead a route he wanted to photograph, so we discussed setting up the shot - where he'd be etc., and he asked me to change my clothing (white T shirt against limestone doesn't stand out very well). Suddenly, I found myself offering to climb without a helmet, just to improve the photograph. Eventually, I realised my folly and kept my hat on. But I surprised myself that I was willing to abandon my principles for the sake of vanity.