‘Can We Drop a Dog Walker for Her Political Opinions?’ asks a letter-writer to this week’s edition of the New York Times’s ethicist column. The writer laments that they have hired a ‘reliable, responsible, and kind’ person to walk the family dog. The problem? Beneath the visage of humanity, the dog walker is actually a monstrous Trump voter.

Rather than stop and ponder the implications of a Trump voter being, in fact, a rather decent human being, the writer gets right to the meat of the matter: Should they fire the dog walker immediately?

Kwame Anthony Appiah, the NYT’s ethicist, was relatively...