In the early 1980s, transit officials in Washington couldn’t figure out why traffic on the Beltway would grind to a near halt every day at the same time. The usual explanations didn’t fit.

Then it was discovered that a single driver was to blame. Every day on his drive to work, this commuter would plant himself in the left lane and set his cruise control to 55 mph, the posted speed limit, forcing those behind him to merge right, and you can imagine the effects.

To his credit, this driver came forward in a letter to the editor of The Washington Post. The man’s name was John O. Nestor. He explained that the left lane was great; less traffic, less merging — why not ride it into work every day? Besides, he wrote, “Why should I inconvenience myself for someone who wants to speed?”

He achieved immortality by being transformed into a Dickensian-sounding verb: “Nestoring,” meaning an absolute adherence to rules regardless of consequences.

Fittingly, Nestor was a regulator at the U.S. Food and Drug Administration and according to him, virtually no drug was worth the risk. The FDA transferred him out of the cardio-renal-pulmonary unit to some bureaucratic backwater because he “had approved no new chemical entities … from 1968 to 1972, an experience that contrasted with the experience of every other medical [sic] modern nation and with the experience of other divisions of the FDA.”

Of course, that made him a hero to activists like Ralph Nader, whose organization praised Nestor’s “unassailable record of protecting the public from harmful drugs.”

And it’s true: If you approve zero drugs, it’s 100 percent guaranteed you will approve no harmful drugs. You’ll also approve no helpful drugs. As we learn more about the human genome, it’s become more clear that what is a lifesaver for many might be a death sentence for a few. Most people can eat peanuts; a relative few of us cannot. The Nestor approach would be to ban peanuts for everyone to prevent anyone from being harmed.

That argument works better for peanuts than it does for new medicines. After all, peanuts rarely save anyone’s life. Drugs, on the other hand, have the potential to work miracles for some patients. Nestor’s tale has gained wide currency as an allegory about the shortcomings of the FDA and the drug industry. But I keep thinking about it in the context of the gun debate.

For instance, it doesn’t take a genius to realize that James Holmes, the man charged in the shooting rampage at the Aurora, Colo., premiere of “The Dark Night Rises,” was at least somewhat inspired by the Batman movies. The evil freak dyed his hair orange and called himself “The Joker.”

But hundreds of millions of people saw one of the Batman movies. Let’s imagine those movies are 100 percent to blame for the Aurora shooting. Even under that ridiculous assumption, that would mean that something like 99.999999999 percent of consumers of those products were unharmed or unaffected. Similarly, the number of law-abiding gun owners dwarfs the number of mass murderers. And guns actually stop crimes, too.

The same problem exists on the mental health side of the equation. We all know people who fit the description of one of these shooters before they killed anyone. Loners, socially awkward, etc. How many turn into mass murderers? How do you weed out the potential mass killers without mistreating the innocent?

President Barack Obama has said that anything is worth it “if even one life can be saved.” Citing Newtown, Conn., in his inaugural address Monday, he said that our journey as a nation will not be complete until we know our children are “always safe from harm.”

Common sense tells us that’s impossible. Moreover, a Nestorite standard would not only do terrible violence to the First, Second and Fifth Amendments, it would hold the freedom, health and happiness of the many hostage to the potentially bad actions of the few.