For social harmony, dotoku is the most useful visa criteria. More than salary, “points”, or current citizenship. The Japanese citizens prove this every day. Regardless of salary, “points” (school name, job description), and without choosing where they were born, the common point is their education in dotoku. And Japan is safe, and calm, and clean.
道徳心は社会の調和を保つ上で確かに重要ですね。ビザ申請の際にそうした側面を考慮するのは、日本らしさを守る上で大切な視点かもしれません。