A historian has pointed out that the four families 'ownership of shares in Fukudai was no different from the stock purchases made by any small-time investor today. Once you've bought stock, your name will appear on a company's list of shareholders. As such, it would be unfair to claim that these families were involved in war-related activities just because the names of some of their members appeared on a shareholders list.
以「四大家族為福大公司股東」這個歷史事實來看，一位歷史研究者指出，就像今天許多老百姓買股票列名某家公司的股東一樣，要以此來證明他們介入戰爭事務並不公平。