Max Boot’s biography Reagan — His Life and Legend will have an importance beyond its worth because its author, once a Republican in good standing, is now a prominent member of the anti-Trump intelligentsia. As a result, Boot, more than an average historian, betrays an agenda. We get a hint of Boot’s ulterior motive in the front matter with a quote from Sherwood Anderson, a now obscure novelist and short story writer, “All men lead their lives behind a wall of misunderstanding they have themselves built.” Tellingly, one of Anderson’s first efforts at writing was a book titled, Why I...