You mention London's Boris bikes statistics a lot. We don't have anything similar here in Glasgow, could I compare the Boris bike trips to a ride in town here? Lots of traffic lights, some cycling lanes, busy but slow motion. Yes, of course, even an off should not cause serious injuries, unless it's just your bad luck.
I live on the outskirts of town: on exiting my cul de sac I have to enter a dual carriage road, speed cameras on it, they are going fast!
Are my chances of a fatal accident not higher on that road?
Self preservation makes me go a roundabout way, unless it's 6am on a Sunday morning

Everything in life is risky, some people/cyclists/drivers like to take their chances, some like to play it safe. On assessing a risk, I really prefer to use my brain rather than rely on statistics. If disaster still strikes, oh well, at least I tried my best to avoid it.