It's massively oversimplifying to suggest that these incidents are purely caused by the fact that some cyclists are riding without skill and judgement!
Basic consideration of the road environment (multiple independent actors with a whole range of abilities, experience and attitudes towards the law + many different road layouts and road conditions and weather conditions etc) tells you that the behaviour of a single group cannot influence things to the degree that they cause their own deaths!
The data says three things:
1. Lorries are disproportionally involved in the deaths of cyclists in London (see data posted above)
2. Collisions between people on bikes and people driving are disproportionally the fault of the driver (see link to Westminster study above)
3. The number of people cycling has massively increased in recent years. By definition that means there's an increase in the proportion of riders who are inexperienced
1. There's a low respect for operating with skill, consideration and within the law amongst all road user groups - cyclists, drivers, pedestrians
2. There's a horribly anti-cyclist attitude in the UK - within the Police, CPS, courts, and many drivers.
Personally I take the advice my Grandad gave to my Mum when she started driving in the early '60s (ie: not new advice!) - "assume everyone else on the road is an idiot"
So whilst when I'm cycling I will keep to the law, to best cycling practice as I understand it, and commonsense, my bitter experience is that it is not keeping me out of danger - too many psychotic, ill-informed, impatient and aggressive drivers out there.
Consideration of the cycling environment, data, anecdote and experience (c5k miles on my bike this year) suggest that whilst my own behaviour can keep me safe to a large degree, there's no way that 100% adherence to best practice and the law will stop getting cyclists killed... that's way too simplistic...
There's a lot of change needed to make cycling safe. Our own behaviour is one contributor but only one...