Wow. It's back, and a sticky too!
For a while there, I thought it wasn't going to be revived. I revived parts 2 & 3, but thought I'd leave it after part 3 shut down to see what would happen.
I also think it's a conversation that needs to be had as the helmet issue looms large in advocacy, and a more complete understanding about what it can and cannot do is important.
Emotion often rides high on the topic and I entered (and briefly left) the original thread based on insults. There's a difference between calling an argument idiotic and an individual idiotic and they are often so tightly wrapped up together, that there can be problems. I think this characteristic is overly represented in this debate.
Still, I think there's an awful lot of misinformation on helmets out there and this thread may be the place to get a better understanding of the issues involved. It's good to see this back on the board.