There is an old maxim, learned less in textbooks than on playgrounds and in rough neighborhoods: the person unafraid of being hit holds an advantage. Not because he is stronger, but because he has altered the calculation. If one participant accepts injury and the other wishes to avoid it, the encounter is no longer symmetrical.
International conflict often operates by the same uncomfortable logic. The question matters now because we are again debating how far conflict in the Middle East can expand — and what actually restrains it.
During the Cuban Missile Crisis, American officials feared not only Soviet weapons but revolutionary psychology — leaders whose legitimacy was tied to sacrifice. Yet the confrontation ended in compromise. Washington and Moscow stepped back not out of trust, but out of fear of mutual destruction. Each understood the other valued survival.
We later learned how fragile that understanding had been. Nikita Khrushchev was startled to discover that Fidel Castro, facing invasion, was willing to risk nuclear war rather than accept defeat. The Soviet leadership was not. The crisis was resolved partly because the superpowers recognized the danger, but also because they understood each other’s limits more clearly than those of their own ally.
The lesson was sobering: deterrence depends not simply on weapons, but on correctly judging what another actor is prepared to endure.
We often reassure ourselves that enemies are fanatics. The twentieth century supplied frightening examples — kamikaze pilots and later terrorist movements that glorified martyrdom. Yet most states, and even many militant movements, do not seek annihilation. Harsh rhetoric frequently coexists with cautious action. This is not moderation in a moral sense. It is calculation. Regimes, like individuals, prefer to endure.
Survival, not martyrdom, remains the dominant human instinct.
And this is precisely where danger appears.
Deterrence works when each side understands the other values survival. It fails when one side convinces itself the opponent either fears nothing or will never respond. A strike followed by warnings against retaliation assumes a monopoly on consequence — the belief that risk runs in only one direction.
History rarely cooperates with that belief. Governments under pressure react according to their own fears, not our expectations. Cornered actors escalate not because they seek destruction, but because they believe destruction is approaching. Self-preservation, the most ordinary human impulse, can become the engine of war.
Peace therefore depends less on defeating an enemy’s will than on correctly understanding it. Wars often begin not when one side desires conflict, but when it misjudges what the other side is capable of enduring — or refusing to endure.
The most dangerous mistake in international politics is not underestimating an enemy’s strength. It is misjudging his threshold.
A stable order rests not on martyrdom but on a shared reluctance to destroy the future entirely. The world is safest not when leaders believe their adversaries are irrational, but when they recognize them as human — cautious, self-interested, fearful, and determined to survive. Conflict becomes most likely when each side believes the other fears war more than it does.
In that moment, the calculation disappears. And with it, the peace that depended on it.