Many accounts of the Nazi period depict a barely imaginable series of events, a nation gone mad. That makes it easy to take comfort in the thought that it can’t happen again. But some depictions of Hitler’s rise are more intimate and personal. They focus less on well-known leaders, significant events, state propaganda, murders, and war, and more on the details of individual lives. They help explain how people can not only participate in dreadful things but also stand by quietly and live fairly ordinary days in the midst of them.

Behind the First Amendment there is supposed to be a principle of free speech that applies to everyone in our society—a strong ethic that says we should never shut down the expression of controversial views just because of their content. The question is whether that ethic of free speech matters more or less on campus than it does in society generally.