“None Is Too Many” was the kind of book most historians could only dream of writing. It’s not that the profession discourages the publication of accessible writing, but that monographs tend, by definition, to not be suitable for mass consumption. For such a book to become an overnight sensation, one that forces a nation to challenge its most basic assumptions, is essentially unheard of. That the same book would become “an ethical yardstick against which contemporaneous government policies are gauged,” and that it would further serve to change — correct, you might say — government policy, makes “None Is Too...