One can spend several days trying not to overreact to President Trump’s latest, unprovoked tweetstorm against the late Sen. John McCain R-Ariz., yet still conclude that there is something sick and twisted about Trump’s obsession with the singular American hero Trump disparages. Tom Rogan already in these pages has eloquently explained why, fake heel spurs or no fake heel spurs, Trump could never be fit to wear McCain’s discarded shoes. And lawyer George Conway, husband of top Trump aide Kellyanne Conway, has presented a persuasive case that Trump’s fulminations about McCain and other bizarre eruptions are signs of a personality...