His murderer was trying to gain celebrity by killing it, and Harrison never spoke his name publicly, an action that I think appropriate enough to emulate. Lennon was, as are a number of young people, angry because the world wasn't as perfect as he thought it ought to be, and he did not grow old enough to realize why. I do not know, given the company he chose to keep, if he ever would have, but he was cheated of the chance by a sniveling, insignificant creep who deserves to die in oblivion and will.
An action that I agree with also. I too have never mentioned the name of Lennon's murderer, neither have I ever mentioned the name of the dirtbag who took a shot at President Reagan a few months later.
I agree that pop stars and other entertainers tend to get taken in by the third-rate intellectual crowd that you speak of. Sadly, only a few ever break free of that influence, due largely in part that highly paid entertainers tend to isolate themselves in a bubble and they lose all contact with regular people. Therefore they live in a virtual world that has little resemblance to reality.