I have been thinking lately about Spock and McCoy, and the strange legacy of one of the most famous relationships in Star Trek.

Even for people who no longer remember much of The Original Series—or never saw it—the cultural shorthand is familiar: McCoy, the passionate human doctor, needling or even berating Spock, the “logical” Vulcan. Spock responds with the raised eyebrow, the pointed ears, and the supposedly emotionless calm. Kirk stands in the middle, representing the familiar formula of human balance between logic and feeling.

It was funny. It was entertaining. It was also, looking back, much more troubling than we were encouraged to see at the time.

What people should have taken from Leonard Nimoy’s Spock was not that logic makes a person cold, robotic, detached, or unable to understand ordinary human decency. The point of Spock—at least as Nimoy played him—was that he felt deeply. He was not a blank calculator. He was someone constantly working to control powerful feelings: loneliness, divided identity, loyalty, fear, grief, love, pride, shame, and pain.

The restraint was the point. The interior life was the point.

Nimoy did extraordinarily subtle work. A glance, a pause, a slight shift in his voice, the rare breaking of that controlled exterior: those things carried enormous emotional weight precisely because they were rare. Spock’s loyalty to Kirk, his concern for the crew, his discomfort with his divided heritage, and his willingness to sacrifice himself were not incidental details. They were the character.

And yet popular memory somehow turned him into the cultural mascot for something very different: the person who has facts but no heart. The most vocal proponent of this stereotype was Dr. McCoy.

“You wouldn’t know what to do with a genuine, warm, decent feeling.”

That was Dr. McCoy berating Mr. Spock. It is not a paraphrase. McCoy actually says it to Spock in “Bread and Circuses,” following it with the accusation that Spock is “more afraid of living” because he might let his human side show.

It is a striking line—not because it is profound, but because it captures the ugly core of McCoy’s recurring posture toward Spock. McCoy is not merely telling Spock that an analysis has missed a human cost. He is telling him that because he is Vulcan, restrained, and analytical, he is unable to understand decency, warmth, and love.

And again, this was not a one-off. This is merely one example of McCoy’s all too predictable, public accusations and insults directed toward Spock. To put it bluntly, Spock tolerated a LOT of shit from McCoy.

That was McCoy’s deep flaw. He often treated Spock’s difference as deficiency. He mistook unfamiliar emotional expression for an absence of emotion. Worse, he treated human emotional style as the standard by which moral worth should be judged.

McCoy could have said, “Spock, your calculation may be accurate, but I think it leaves out the human cost.” That would have been legitimate. It would have been useful. Somebody should say that in any serious decision.

Instead, too often, the message was: “You are cold because you are logical. You are less capable of decency because you are not emotionally like me.”

That is not a defense of humanity. It is human exceptionalism. And it is simply wrong.

The Vulcans were never emotionless machines waiting for humans to teach them how to feel. If anything, their emotions were meant to be so powerful and dangerous that they developed an entire civilization around controlling them. Vulcan logic was not a failure to feel. It was a response to feeling too much, and to recognizing that anger, fear, tribalism, pride, and impulse can destroy a civilization when left unchecked.

That should have been a useful lesson. Instead, the public often absorbed the opposite one: emotions are what make us human, so someone who restrains or regulates emotion must be less human, less compassionate, less trustworthy, and perhaps morally suspect.

I have run into that attitude constantly in my writing, particularly in Pandemic of Delusion, and in talks about fact-based thinking. I will argue that we should care about what is true, that we should distinguish evidence from assertion, that good intentions do not excuse false claims, and that compassion is not enough if the beliefs motivating it are wrong.

And sooner or later, someone inevitably invokes Spock.

Not usually in a thoughtful way. Not as a serious discussion of the tension between values, facts, and making decisions under uncertainty. Rather, “Spock-like” is invoked as a warning: evidence-based thinking will turn you into a cold person who cannot understand ordinary human feeling.

It is one of the more frustrating cultural reflexes I have encountered. It allows people to evade the actual question—whether something is true, whether an intervention works, whether a claimed cause really produces the supposed effect—by turning the person asking for evidence into a character problem. The implication is that concern for facts means lack of concern for people.

But facts are not the opposite of compassion. They are the opposite of falsehood.

If we care about people, we should care whether our beliefs are accurate. We should care whether an emotional solution actually helps or merely makes us feel as though we have helped. We should care whether a frightening claim is real, whether a treatment works, whether a policy reduces harm, whether an anecdote represents a genuine pattern, and whether a comforting explanation is actually just another delusion.

Emotion can tell us that something matters. It can alert us to suffering, injustice, danger, loss, attachment, and values. But it cannot tell us, by itself, what is true. It cannot tell us whether a vaccine is dangerous, whether a conspiracy is real, whether a miracle cure works, whether a political claim is accurate, or whether the policy we favor will have the result we hope for.

The fact that this needs saying at all is part of the problem.

The better lesson of Spock was never that emotion is bad. Nor was it that logic alone can answer every question. Logic cannot tell us what we should value. It cannot tell us whose suffering matters, or what sacrifices are morally acceptable. But neither can emotion tell us which beliefs are true. It cannot make a false claim true because we feel it deeply enough.

Spock and McCoy should have represented two different cautions. Spock should have reminded us that desire, outrage, fear, and loyalty are not evidence. McCoy should have reminded us that calculation can conceal real human costs and unexamined moral choices.

Instead, McCoy’s contempt became part of the cultural memory, while Nimoy’s remarkable portrayal was flattened into a stereotype. “Spock” became shorthand for coldness. “Human” became shorthand for emotional superiority. And fact-based thinking became entangled with a ridiculous fear that caring about reality somehow means caring less about people.

What makes this more than an old television complaint is that the shorthand escaped the show. Many people using “Spock-like” today are not carefully recalling an episode of Star Trek. Some may never have watched The Original Series at all. They carry only the cultural residue: pointed ears, raised eyebrow, logic, coldness, emotional deficiency.

The original show is old. Much of it is dated. Many of its stories are barely remembered except by diehard fans. But the stereotype survived because it became so very useful. It became a quick way to accuse someone of being insufficiently human without having to show that they were wrong.

That is what stuck. Not Spock’s loyalty, restraint, courage, humor, grief, divided identity, or willingness to sacrifice himself for others. Not Nimoy’s portrayal of a person with a rich interior life who refused to let feeling become a substitute for judgment. What stuck was McCoy’s arrogance, bigotry, and contempt for the idea that someone who thinks carefully can also care deeply.

McCoy’s contempt for logic took a lasting hold on our cultural imagination. Spock’s introspective subtlety, and his respect for facts and reason, did not.

What was lost was Nimoy’s Spock: a person who felt deeply, endured difference, valued truth, understood duty, loved loyally, and tried—often imperfectly—not to let anger, fear, wishful thinking, or tribal attachment determine what was real.

That is not a cold ideal. It may be one of the most humane ideals there is.

And it is a shame that so many people inherited the insult while missing the lesson.