There does seem to be a line of thought here that however idiotic a cyclist is, its always the drivers fault which is patently wrong.
I don't think people are saying that, it's more a reaction to drivers involved in incidents saying they didn't see them, even if they were cycling normally and were reasonably illuminated. I'm sure we've all experienced incidents with drivers that didn't see - whether when on a bike or in a motorised vehicle - because they weren't looking or paying attention.
I agree that drivers should be aware of and take every precaution to prevent injury to other vulnerable road users, but cyclist also have a responsibility for their own safety and must share the blame if they fail to do that. Unfortunately if a ninja rider gets taken out by a careless driver, the driver will probably get off lightly because they will be able to shift at least some of the blame to the cyclist.
Living in Cambridge we see large numbers of cyclists with suicidal tenancies so probably the vast majority of us drivers around here take extra care. Luckily all 3 collisions I've had with a cyclist have happened when I've been on my own bike (2 cut straight across me and the other fell off just as I was going to pass) but I've had some near misses in the car either with someone cutting across my bows, or when some ninja comes up your inside when you are clearly turning left or overtakes you when you are turning right.
But as the stats show - cyclists lacking lights or behaving recklessly are a very small percentage of those killed or injured on the road.