IT IS THE FATE OF most presidents to watch the inauguration of their replacements with rueful thoughts: in the words of King Lear, “They told me I was everything. ’Tis a lie.” As Joe Biden prepares to pass the torch to Donald Trump, I find myself reflecting on Biden’s own hand in this humbling ordeal. In those whirlwind weeks of blame and recrimination after his disastrous June debate, Biden was often compared to Lear: an aged sovereign with no clear successor, not entirely sound in mind, undone by a crisis born of vanity, vengeance, and fickle nature. Like Lear, Biden had been insulated from criticism, preferring loyalty to blunt counsel, collusion to collaboration. Like all tragic heroes, he suffered from certainty, monomania, an unwillingness to yield. Shakespeare’s tragedies, write Adam…