Majenta Spiral,imho,I think you are taking A M KM's words out of context. I think if you take a minute to reread what he wrote you will see that.
The message I got from his response was that in general people saw what John was writing and singing about much more clearly after his death. Sort of like understanding the force of a hurricane after living through one. That is human nature and not really a choice.
Also,A M KM states he would have preferred John's music over Paul's as he got older anyway (that part having nothing to do with John's untimely death).