When Justice Department Inspector General Michael Horowitz published his report on the Hillary Clinton email investigation, some of us began to suspect that he was the deep state’s most clever ultimate protector. The IG’s strategy was to find a long list of malfeasances with which to excoriate an institution, in this case, the FBI—abuses that might, under normal circumstances, land multiple people in jail—slap the miscreants firmly on the wrist, and then let everyone off at the end with a disingenuous excuse (in the Clinton affair, a supposed similarity to the vastly less-serious accusations against Alberto Gonzalez, for which Bush’s...