Following her defeat in the 2016 general election, Hillary Clinton published a book titled What Happened. While that tome is not considered a classic work of political analysis, its implied titular question animates a good deal of writing about politics these days, including two books released over the past year: Zack Beauchamp’s The Reactionary Spirit and Quinn Slobodian’s Hayek’s Bastards. Both books are attempts to grapple with the significance of the political energies of which Trum...