Although his books had been banned for sale in the prewar time as the books lacking respect for the emperor, many historians came to support his books as an approximately reasonable assumption when the taboo against discussion of the Emperor system was removed after World War II.
戦前彼の著書は不敬であるとして発禁処分とされたが、戦後になって天皇制のタブーが解かれると、多くの歴史学者によっておおむね妥当な推論であるとして支持されるようになった。