Of all the things to feel Jewish guilt about, we can now add “not killing Hitler.”

At least if you’re a woman.

According to a recent research paper that isn’t made up and actually got published—in something called the Personality and Social Psychology Bulletin—women feel less comfortable killing the long-deceased Nazi leader in a time-travel thought experiment.

In the paper, which analyzed 40 studies involving 6,100 respondents, 60 percent of men were willing to kill Hitler, to 55 percent of women.

So do women hate killing in general more than men? Do they like mass murderers more? Or is it just because they don’t like any questions with science fiction in them?

Dr. Paul Conway, Ph.D., a postdoctoral fellow in psychology at the University of Cologne and one of three authors of the paper, said that his paper describes a gender bias that appears across all moral decision-making—even in those rare real-world decisions that don’t involve either the Führer or a time machine.

“Men pretty much mainly rely on their logic,” said Conway. “That doesn’t mean that women are not logical. Women and men are very similar in how much logic they apply. They both get it. They know that killing Hitler to stop WWII is better for everyone. It’s just that men say, ‘I’ll do it’ and that’s all. Women say, ‘but also, I really don’t want to kill someone.’”

In other words, women would be better at running the world without blowing it up.

“You know, I’ve kind of been arguing that a little bit,” Conway replied.

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But let’s get back to killing Hitler, because, let’s face, that’s why we’re all here.

I did my own important killing-Hitler research, using my Facebook friends, and found the opposite gender difference as did the paper.

Half of my female friends declared they’d do the deed. (One wrote that she would tell Hitler: “My name is Einit Borowsky. You killed my grandfather. Prepare to die.”)

But fully 82 percent of my male friends refused, citing problems with the space-time continuum and, in two cases, with their own existence since their grandparents wouldn’t have met without Hitler.

In other words, saving 11 million lives wouldn’t be worth sacrificing their little old selves, and Mr. Spock is rolling in his grave.

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Actually, the question is so common in our culture, it was the plot of a Twilight Zone—not one of the original great ones, but a 2002 remake that no one cared about, although Katherine Heigl was in it so that makes it cool in retrospect.

The episode posed the even more difficult moral question of whether to kill Hitler while he was still an innocent baby. (My Facebook friend Michael Roth didn’t find it more difficult, however, declaring that he’d “rip his little arms out of their tiny German sockets.”)

“These are great things to think about and they’re lots of fun,” Conway said, “but they aren’t really any of the processes we’re hoping people are using to answer these difficult questions.”