Clausewitz Had a Pope

Nobody expected the Vatican to weigh in on autonomous weapons with something worth reading. Magnifica Humanitas, Pope Leo XIV's first encyclical, released May 15, covers artificial intelligence, social justice, and the digital economy across fifty-two dense pages. Most defense analysts will skip it. That's a mistake.

Not because Leo XIV is right about everything — he isn't — but because buried in Chapter Five is a strategic argument that Clausewitz would recognize immediately, and that the Pentagon has been quietly getting wrong for thirty years.

The argument runs like this. Clausewitz's central claim in On War is that war is never autonomous violence but always an extension of political intercourse — the continuation of policy by other means. That phrase gets quoted constantly and understood rarely. What it actually means is that war has a governing purpose outside itself, a political will that both directs and constrains the violence. The moment that connection severs — when violence stops serving a political objective and starts generating its own logic — war tends toward what Clausewitz called the absolute: unlimited, ungovernable catastrophe. It's not a moral claim. It's a structural one.

Leo XIV arrives at almost exactly the same place from a completely different direction. His argument in the encyclical isn't primarily that autonomous weapons are immoral, though he believes they are. It's that they sever violence from the deliberative human judgment that gives force its political character. When he writes that AI "can only bring about conflict more quickly and render it more impersonal, lowering the threshold for resorting to violence," he's describing the erosion of Clausewitz's governing principle. He goes further: moral judgment "involves conscience, personal responsibility and the recognition of the other as a person," and for that reason cannot be delegated to machines. Strip those out of the targeting loop and what remains isn't war in any Clausewitzian sense. It's something faster, more lethal, and ungovernable.