The gravest AI disasters may arrive through ordinary delegated decisions

A Guardian letter makes a useful correction to the cinematic picture of AI catastrophe. Hiroshima was a deliberate human use of a technology that worked as intended; many AI disasters may look nothing like that. A model could help design a pathogen, find a critical-infrastructure vulnerability, or improve a weapons system while people still formally make the final decision. Other harms may accumulate through thousands of routine choices: one more autonomous task, one safeguard removed after a streak of good performance, and one consequential decision handed over because the system appears reliable. This framing matters because a governance regime focused only on a visible rogue takeover will miss the transfer of authority happening inside ordinary operations. The letter proposes a practical starting point even without international agreement about superintelligence: identify doors AI should never open by itself, require clear human authority for consequential actions, retain records of who authorized what, and share serious failures and near-misses. The stronger standard is not merely keeping a person somewhere in the loop. It is ensuring that a named person has enough information, time, competence, and power to stop the action. Institutions should measure cumulative delegation before a chain of reasonable decisions becomes an irreversible system.