convertibles and helmets

Am I the only person who feels that people in convertibles should be wearing helmets? Every time I see someone driving one I feel like they legally need to wear helmets. I have a visceral response to seeing them, especially with children in the car, and I feel as though helmets are necessary precautions. I feel like they need to wear helmets... until I remember that they don't. And then I shake my head and think they should wear them anyway.