In an open letter titled "Yasegaman no setsu," Yukichi relentlessly criticizes Kaishu KATSU and Takeaki ENOMOTO (both of whom had been vassals of the shogun but served the Meiji government) with a well-reasoned argument by quoting sentences of all ages and stressing his fairness by stating that Yukichi was understanding the difficult positions of KATSU and ENOMOTO.
『瘠我慢の説』という公開書簡によって、海舟と榎本武揚（共に旧幕臣でありながら明治政府に仕えた）を理路整然と、古今の引用を引きながら、相手の立場を理解していると公平な立場を強調しながら、容赦なく批判している。