In many ways the helmet camera has sort of answered the question about cyclist safety - what other group feels compelled to resort to that? I have bought a camera and so far not bothered to fix it on. Interesting what you say about drivers being cross about being filmed. I think that if we all had to abide by the rules of the road drivers would have more to lose than they think.The instant liability problem is a toughie, I can see both arguments and not an easy answer.
The subject of cyclists wearing helmet cameras seems to be upsetting a few motorists, I'm a bit surprised by that unless they know their driving is bad and that's scary as it means they just don't care. Maybe mounting a camera is a good preventative measure rather than just for proof after an accident, I'm not really keen on that but if it improves driving in my vicinity then I'll have to accept the possibility of awkward questions from inquisitive coppers.
PS I think there has been a bit of a back-lash by cyclists about the others that go through red lights. Many more are waiting and even today another cyclist yelled at one for going through the light - not seen that for years as it would be so futile!