The tidal wave of grief that followed the murder of John Lennon on Dec. 8, 1980, flowed from several sources. Perhaps the most gaping of these was the shocking obliteration of a decade's worth of hope. Millions awoke one morning bleak with the promise of winter to learn that now the Beatles could never get back together, that the expansive spirit of the '60s had definitively expired ten years past its prime.
But there were other, more pertinent reasons for mourning Lennon's passing. He was not simply the megastar founder of a legendary rock group but a demonstrably troubled man who...