I understand your thoughts on the police being reluctant to prosecute. The reason being is that they claim it is more likely for the easier option for them to actually take place, and they dont want to have to do the work involved in a prosecution.
I had an incident in July with a guy, road rage related (no collision). The police made everything sound as though there would be a good outcome but in the end all I wanted was an apology. However, after the police showing the driver the footage, the guy didnt want to apologise although he accepted he was in the wrong.
Obviously the police cannot force people to apologise but I wasnt happy with the outcome.
I saw the driver a few weeks ago but fortunately he didnt see me as I was in traffic at the time. I am sure if he had seen me he would have at least said something (but then it is witness intimidation).
Unless something serious happens, nothing to your liking is the outcome. Sometimes you just have to accept that most people cannot be bothered helping others even though the police is a public service. Though saying that, when something serious does happen, the police do help and they are an attribute if you are injured/damaged.