Some also consider that a decision was made, trying to solve the problem by force of arms, taking into consideration the nature of Kamakura bakufu as a military government, or trying to prepare the defense system by alerting its people about a threat from foreign countries.
また、武家政権である鎌倉幕府の性格からの武断的措置であるとする解釈や、対外危機を意識させ防戦体制を整える上での決定的措置であるとする考え方などがある。