Point taken. What about those who have loud music? Neither can they hear what's around them. Still seen a cop car lately? And unlikely a camera would pick it up.
Cyclists should get real. They take up the road to deliberately slow motorists down, think all motorists are going to notice them, shout and indicate obscenities if you get 'too' close and what's more don't seem to be on the lookout for themselves (I always glance behind when a vehicle approaches just to make sure it has noticed me and get ready to stop well in if necessary). And those that go along in the dark (and I mean also in shade during the day) with non contrasting clothes on are obviously on a suicide mission! That includes walkers too. Consideration all round works.