President Trump last spring pardoned Dinesh D’Souza, the conservative commentator and filmmaker who pleaded guilty in 2014 to making illegal campaign contributions. D’Souza has been criticized even by fellow conservatives for his frequently racially-charged public output, such as his decision to criticize former president Barack Obama’s use of a selfie stick by tweeting, “You can take the boy out of the ghetto…” and his repeated claims that Obama’s policies were steered by his Kenyan father’s anti-colonialism. While most of his output centered on critiques of liberalism, D’Souza’s long career as a pundit and writer has also led him to make...