From another critical viewpoint, it is suggested that the Bakufu failed to take adequate measures upon the arrival of the Black Ships due to a lack of knowledge involving diplomatic procedures resulting from excessively severing exchanges with foreign countries, and this resulted in the Bakufu being forced to sign an unequal treaty.
他にも度を過ぎて交流を絶ったために外交手段が分からず、黒船来航の際に対応を誤り、不平等条約を結ばされたとする批判的な意見もある。