Since Hiroshima and Nagasaki in 1945, the world has lived under one of history's most remarkable strategic arrangements. Nuclear weapons have existed for more than eighty years, yet not a single nation has used one in warfare since the Second World War. During those decades humanity has fought countless conventional wars, endured proxy conflicts, terrorist campaigns and regional invasions, yet the nuclear threshold has remained uncrossed. This unwritten restraint has become known as the nuclear taboo. Although never universally accepted as law, it has arguably become one of the strongest behavioural norms in international politics.
Now imagine that barrier being broken.
Suppose American intelligence concluded that Iran had constructed a deeply buried nuclear facility beneath a mountain that could not be destroyed by even the most powerful conventional bunker-busting weapons. Military planners might eventually confront a question that previous generations have successfully avoided. If every conventional option fails, should a low-yield nuclear weapon be used to destroy a hardened military installation before it becomes operational?
At first glance the military logic appears compelling. Advocates would argue that such a strike would not resemble Hiroshima or Nagasaki. The objective would not be the destruction of cities or civilian populations but the elimination of a specific underground military target believed to threaten regional and perhaps global security. If one limited nuclear strike prevented a future nuclear-armed Iran and thereby avoided a much larger war, some strategists would argue that the overall humanitarian outcome might actually be better.
The problem is that military logic is only one dimension of the issue. Political philosophy reminds us that actions have consequences extending far beyond their immediate objectives. Governments do not merely destroy targets; they establish precedents. Once an action has occurred successfully, it inevitably changes what future leaders regard as politically and morally possible. History demonstrates repeatedly that the first use of a weapon or tactic is always the most controversial. The second use becomes easier because someone else has already crossed the line.
This is why the greatest danger of using a nuclear weapon against an Iranian mountain facility may not be the immediate military consequences. The greater danger may lie in what happens afterwards. For eight decades nuclear weapons have occupied a unique moral and strategic category. Chemical weapons have occasionally reappeared despite international prohibitions. Biological weapons have remained a continuing concern. Conventional bombing has never ceased. Nuclear weapons alone have remained effectively quarantined by a combination of deterrence, fear and moral revulsion. They have become weapons whose very existence discourages their use.
If that barrier were broken, however carefully or for however limited a military purpose, the psychology of international politics would change overnight. Russia could point to the American precedent during some future confrontation in Europe. China might invoke it during a crisis involving Taiwan. India and Pakistan could reinterpret their own nuclear doctrines. North Korea would undoubtedly conclude that the world had entered a new strategic era. Even states without nuclear weapons might accelerate their own weapons programmes, reasoning that if nuclear weapons are now usable in limited circumstances, possessing them becomes even more essential for national survival.
This illustrates one of the oldest insights of political philosophy. Human societies are governed not merely by written laws but by unwritten expectations. Every civilisation inherits assumptions about what responsible nations do and what they refuse to do. These expectations often prove more powerful than formal treaties because they shape the imagination of political leaders. Once an established norm collapses, rebuilding it is extraordinarily difficult. International relations become less predictable because the boundaries that once constrained behaviour have disappeared.
None of this implies that democratic governments should ignore genuine threats. If reliable intelligence indicated that a hostile regime was on the verge of acquiring operational nuclear weapons with aggressive intentions, political leaders would face an exceptionally difficult moral dilemma. Governments exist first and foremost to protect their citizens, and no responsible administration can simply ignore existential dangers. The question is not whether such threats should be confronted, but whether confronting one danger creates another that may ultimately prove even greater.
Strategic thinking therefore requires attention to second-order and third-order consequences rather than focusing solely upon immediate tactical success. Destroying a mountain facility may eliminate one nuclear programme, but normalising nuclear first use could permanently alter the strategic calculations of every nuclear power on Earth. The short-term military victory might be outweighed by a long-term deterioration of the international security environment.
History repeatedly demonstrates that technological capability advances more rapidly than ethical restraint. The machine gun transformed warfare before governments fully understood its consequences. Strategic bombing expanded dramatically before serious moral reflection occurred. Cyber warfare has developed faster than international law can accommodate. Nuclear weapons remain the most dangerous example because their destructive capacity places civilisation itself at risk. Humanity has spent eighty years constructing an informal but remarkably resilient understanding that these weapons belong in a fundamentally different category from conventional arms.
Some military analysts reject that distinction, arguing that modern low-yield nuclear weapons are simply very powerful explosives whose use should be judged according to military necessity rather than historical symbolism. They maintain that if a nuclear weapon destroys only a hardened military target and minimises civilian casualties compared with prolonged conventional warfare, there is no rational basis for treating it differently. This argument possesses a certain internal logic, yet it overlooks the role that symbolism plays in international politics. Human beings do not respond only to physics; they respond to precedent, memory and shared expectations. Once nuclear weapons become politically usable, the threshold for future use inevitably falls because later leaders will be able to point to earlier examples.
Perhaps that is why the post-1945 nuclear restraint deserves greater appreciation than it sometimes receives. It has survived the Cold War, the collapse of the Soviet Union, multiple regional conflicts and repeated crises between nuclear powers. The world has managed, however imperfectly, to preserve the idea that nuclear weapons are different. That achievement may ultimately prove as significant as the invention of the weapons themselves.
The debate over Iran therefore extends well beyond one underground facility or one regional conflict. It asks whether humanity wishes to preserve the extraordinary restraint that has characterised the nuclear age or whether it is prepared to redefine nuclear weapons as simply another tool of war. If the latter course is chosen, the immediate target may indeed disappear beneath tons of shattered rock. Yet the precedent established could endure for generations, reshaping strategic thinking across the globe. Some bottles, once uncorked, are extraordinarily difficult to seal again, and the nuclear genie may prove to be one of them.
https://ryanmcbeth.substack.com/p/would-nuking-iran-give-russia-an