I think anyone who doesn't use a bicycle helmet is ignorant. I personally think most of the bicycle helmets out there are quite stylish. Maybe I use one 'cause it save me from a nasty headbruise when I was seven.
It makes me happy to see kids (and people in general) wearing helmets, it means the message is getting through. On the other hand, for every helmet wearing biker there's at least four that don't wear the cheap life insurence. In Finland 25% of bikers wear helmets, way to few. The bureau of traffic safety has tried extensive campaings to increase the usage of bicycle helmets, but so far in vein. According to statistics no biker in Finland has ever died of headtrauma while wearing a helmet.
It's bisturbing to see the kids riding bikes with the helmet just dangling on the handlebars. They obviously own a helmet, but they don't use it because it doesen't look cool or something like that.