I posted as a parent and resident who has been involved for eight years in a campaign to stop motorists racing through our street, using it as a short cut to avoid traffic lights on the main road despite the street being restricted by law to access only.
My experience has been that the Police are always ready to take action and indeed we have dealt successfully with two habitual speeders in the street with their help. However I was trying to convey (possibly clumsily) my belief that Police officers, just like all other humans, are only capable of giving limited attention to a problem when it arises again and again and when reported by the same people again and again, especially when their time and energy is being taken up by more serious crimes. I can envisage a scene where traffic officers who have just attended an unpleasant and distressing accident might even witness a near miss with a cyclist, see the cyclist survive with only dignity injured and laugh it off as a comical incident. They are humans like the rest of us and sometimes the cycling public needs to cut them some slack.
This has nothing to do with deliberate malice by motorists against cyclists, which is not the same as the thousands of little errors of judgement and lapses of concentration, which happen on the roads every day.