I'd worry about derailing or diverting this thread, but it's about helmets so, you know... :-)
First, for all of those worried about all those life changing injuries you'll get not wearing a helmet, I offer you
Thrasher Hall of Meat the joy of skateboarding magazines and their helmetless bails (even if they were proved 100% efficient they wouldn't wear one because it's not cool). This is really just because talking in the car about this subject my 20 year old brought up the fact that heads are actually quite tough (as has been mentioned elsewhere.) nb I've not watched these videos, I have no idea if they are work safe, etc. I'd imagine there will be blood and probably loudly played music by popular beat combos.
Secondly, I'd be interested to know why the anti-compulsion side doesn't seem to be putting cycling's own house in order. I was at the NEC for the bike show, there was the option to try out bikes. If you wanted to do that, you
had to wear a helmet (I think this was for all of them, it was definitely the case for the 'premium bikes' bit). My LBS does Sunday ride outs, allegedly no-one is dropped from the slow group (this is a lie, but we'll skim over that) we we're not talking all out on the rivet chain ganging here. They do have one rule though, all riders
must wear helmets. It goes on, there are loads of areas within cycling itself that are pushing compulsion. If we want to see an end to the implied threat of compulsion, and maybe a lessening in the number of helmeted riders. I would be interested in stats on that, how big a survey would we need to do for it to be valuable? I'd sit on a chair for a day with a couple of clickers if it would help work out where we were with numbers. Presuming nobody already has. Wouldn't a sensible place to start things off be to do a serious push for the places that show off cycling to be less one track about helmets (I'm trying to think back to watching the cycle show, from memory it was pretty much 100% helmeted, no?). Just a thought.