9‍/‍11, as every­one agrees, was a ter­ri­ble atroc­i­ty, maybe the worst sin­gle ter­ror­ist crime ever. Undoubtedly had major con­se­quences which we are liv­ing with. It may be use­ful to car­ry out a thought exper­i­ment and ask how bad it could’ve been. It could’ve been much worse.