Last month, the journalist John Tierney wrote a sly piece for the Science section of The New York Times called “Social Scientist Sees Bias Within.” It brought the news—news to many readers of the Times, anyway—that psychologists as a group are biased against . . . conservatives.

What a revelation! Who knew? “Discrimination,” Tierney writes, “is always high on the agenda at the Society for Personality and Social Psychology’s conference.” Who would doubt it? Racism. Sexism. “Homophobia” (the scare quotes are in deference to sensitive etymologists who will wince at the nonsensical construction). You know the drill. Our favorite item on this menu is “unconscious bias”: what a delicious invitation to meddlesomeness that pseudo-category opens up!

But at the annual meeting of this academic organization in J ...