"Speed is almost always a crucial factor in the *outcome* of the accident..."
True - but there's a lot of other factors. Condition of the vehicle, weather, other traffic, experience etc.
How about a curfew for drivers with less that 20,000 miles under their belts? Or maybe only cars that have been serviced in the last 3 months can go out in the rain?
A factor it maybe, the cause it's not so often. The cause is normally driving for the conditions - including the surroundings, time of day, weather, vehicle condition and other road users.
I personally hate speed camera's - there is no grey area, no circumstance is taken into account and it targets just one small factor of something that contributes to the outcome - NOT the cause.
Make the tests tougher, put actual police officers on the road that STOP tailgaters, people that don't indicate, lane hogs, overtaking on blind corners etc.
But there is no magic silver bullet that can be palmed off to technology then is there? The solution would be the traffic police actually working rather than sitting in a van pointing a camera or speeding past 60MPH traffic themselves whilst not attending an emergency.
So we end up with a bullshit policy that serverly targets a factor that makes some accidents worse rather than targeting the cause. Policy costs a fortune, does little to reduce accidents or deaths and has an impact on nearly all drivers regardless if they are driving safely or not.