If you make a choice to take up skydiving, you make sure you have all the right equipment, you know what to do and how to behave.
Likewise Horseriding, skateboarding, rock climbing, pot holing, hiking, orienteering.
Cycling on our busy roads is a potentially dangerous pastime/method of transportation. If a cyclist doesn't obey road signs, traffic lights, markings, or if they are tuned into iPods, talking on the phone, or not paying enough attention to their surroundings they are potentially placing themselves into the path of large fortified metal boxes travelling at great speed, and therefore at great risk of a collision.
They must understand that in a straight battle between a soft and fragile human and a hard metal box travelling at speed, it actually doesn't really matter WHO is the one that is at fault, THEY are going to lose.
With this in mind, it is absolutely essential that those that choose to use 2 wheels (and I AM including Motorcyclists here) have to accept some responsibility for their own mortality and do the very best they can to ensure that they are SEEN, they are where they ought to be WHEN they ought to be and NOT to disobey all signs, directions and road regulations just because they are technically agile enough to do so.
Yes some car/lorry drivers are not as good/considerate as they should be, but they are not potentially putting their lives at risk if they hit a bike. A bike rider darting up the inside, in dark clothing with poor/no lighting, ignoring the highway code, road regulations IS at greater risk and needs to therefore behave more responsibly.
The onus of cyclist death is not solely on car/lorry/bus drivers, it has to be shared by those most vulnerable, they must do all they can to minimise the risk to themselves.