A lot of this is driven by business which has a product to sell. They have figured out a very good sales patter which works very well on governments. You cannot really blame them for this as it is their role to sell believe the blame lies with the ignorant customers (in this case the government) who cannot understand and see through the sell.
Same happens here with both Speed cameras and CCTV cameras. Both have great sales campaigns by the retailers with little to show in actual results. So it does not work exactly as we said just means sir that you need the newer bigger version then it will work. Rather than questioning why it will work this time when did not before just swallow the sales patter and buy again so do not have to admit were wrong to buy the first time round.
We do not have fixed spped cameras around here. The police still actively monitor speed via speed guns and traps. In most places in the UK these have been replaced with fixed spped cameras and the police removed from the road. Every so often a 'safety campaigner' appears in the media to complain that the police here are not taking speed seriously as we do not have fixed speed cameras. It is this blinkered mind set of the people who make the decisions that is the real problem.

