I'd say natural selection at work, leave them to take the risk of removing themselves from this chaotic life we lead.
unfortunately not as simple as that... others get involved as well
I've seen the cost of a injury/fatal RTC to the public purse quoted at several thousand quid... they take up a lot of NHS resources
the incident mentioned here was the OP, a man in his fifties, nearly being injured as a blameless innocent pedestrian - if he had been hurt have then probably been denied the ability to ride his own bike until he recovered... no justice there..
say some young chav talks on his phone and is involved in a collision with a car... press freedom means everyones location is listed in the crime report, it would be easy for the chavs friends/associates to locate the driver and his/her family and intimidate them... either via Facebook or in real life.. round here the aftermath of "normal" RTC's often result in feuds between families lasting generations (to the point the cops have to watch both familes like hawks, particularly if the young males of each family should encounter one another in a pub or club..)
perhaps the use of cops/PCSOs in areas where this behaviour is endemic is one part solution -a £30 fine is £30 less to spend on phone credits....
I work as an IT manager, extension 222 from all the offices will contact my mobile - but if I tell staff "I am on my bike" they are perfectly happy to wait for me to call them back when I am in a safer place...