I used to do motor rallies in those days and everybody who rallied fitted halogen lights. They all also used to be very careful about light settings; the cars had to pass scrutineering and the Police would do random safety stops on rally cars. Nevertheless, being flashed by people objecting to the halogen lights was something everybody who had them experienced.
The bottom line is that you are convinced that the problem was badly set lights, while I am convinced that there is more than enough evidence that it was simply the brightness of the lights. It is not something that can be resolved half a century after the event, so there really isn't any point in continuing like a couple of Panto performers, repeating oh yes it is, oh no it isn't.