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.
Both men are making the same underlying claim: violence without a responsible human mind continuously directing it toward a political purpose tends toward the absolute. The mechanism Clausewitz identified for preventing that outcome is what he called the remarkable trinity — passion, chance, and reason. The passion of the people fuels the will to fight. The play of chance and probability is what commanders navigate in the field. The reason of government directs it all toward a political end. These three elements don't simply describe war's participants. They describe the forces that must remain in tension for war to stay beneath political control. Let any one dominate and the balance collapses — war either burns into nationalist frenzy, dissolves into military freelancing, or gets reduced to cold calculation untethered from human consequence.
AI doesn't threaten one leg of that trinity. It threatens all three simultaneously. It attempts to neutralize chance through predictive analytics and sensor saturation. It strips passion from the targeting process by reducing enemies to data signatures and probability scores. And it displaces reason — not by eliminating it, but by delegating it to systems that cannot bear political responsibility for what they decide. Leo XIV sees exactly this dynamic when he argues that moral judgment "involves conscience, personal responsibility and the recognition of the other as a person" and therefore cannot be handed to a machine. That's not theology dressed up as strategy. That's a precise description of what happens when the trinity loses its human anchor.
Where the convergence deepens further is friction. Clausewitz was writing about a world where fog, exhaustion, and human error naturally slowed warfare down and created space — space for political judgment to reassert itself, for escalation to pause, for a commander to reconsider. Friction was a problem to be managed. It was also, implicitly, a governor on absolute violence.
AI is explicitly a friction-reduction technology. Faster targeting cycles, better ISR, algorithmic decision support, autonomous systems — all of it is designed to compress the gap between sensing and striking. Western military doctrine has spent three decades treating that compression as an unambiguous good — the RMA, network-centric warfare, OODA loop dominance, kill-web architecture — on the assumption that reducing uncertainty improves both effectiveness and restraint.
Leo XIV and Clausewitz together suggest the opposite. When the encyclical insists that "speed and efficiency should never be the supreme motivating force for irreversible decisions made in the context of war," it's making a Clausewitzian argument in theological language. Compressed decision cycles don't just risk errors. They structurally prevent the deliberation that keeps the trinity in balance and violence politically governed.
Consider Stanislav Petrov. In September 1983, a Soviet early-warning system reported an incoming American missile strike. Petrov, the duty officer, sat with the alert for several minutes before concluding it was a false alarm — a judgment call made against the data, on instinct and experience, in the deliberative gap between sensing and acting. An automated system would have responded. His willingness to absorb uncertainty rather than optimize it away is the reason this article exists and you are alive to read it. That gap is precisely what AI-enabled warfare is designed to eliminate.
The defense community has been asking whether autonomous weapons can be made ethical enough to deploy. That's the wrong question — or at least an incomplete one. Leo XIV and Clausewitz together suggest the more fundamental question is whether systems that remove deliberative human judgment from the targeting cycle are strategically coherent at all. Not because they violate moral norms, though Leo XIV believes they do. But because they undermine the political governance of violence that is the only thing distinguishing war from catastrophe.
A Prussian strategist writing in the aftermath of Napoleon and a Chicago-born Pope writing in the aftermath of AI reached the same conclusion from entirely different starting points and two centuries apart. That convergence doesn't prove they're right. But it's a serious argument, and it deserves a serious response — not from theologians, but from the people designing kill-webs and autonomous targeting systems and compressed decision architectures.
So far, the response has been silence. That silence is its own answer.
Andrew Latham, Ph.D., a tenured professor at Macalester College in Saint Paul, Minnesota. He is also a Senior Washington Fellow with the Institute for Peace and Diplomacy in Ottawa and a non-resident fellow with Defense Priorities, a think tank in Washington, D.C.
image: Pope Leo XIV blesses the audience at the end of the presentation of his first encyclical, "Magnifica humanitas: On Safeguarding the Human Person in the Time of Artificial Intelligence," at the Vatican, Monday, May 25, 2026. (AP Photo/Alessandra Tarantino)
