This was a reflection of the government's special circumstances, a 'critical moment,' such as the cession of Hong Kong by Qing after the defeat of the First Opium War, and the opening of the country to the world (refer to Ansei Reform).
これは、アヘン戦争敗北を受けた清の香港割譲・開国など幕府の「危急存亡の秋」という特殊事情が反映されたものである（→安政の改革参照）。