You make a very good point. Regarding the Korean example, I’d conclude that Koreans are more likely to get involved in organized crime in Japan because of structural factors of Japanese society and economy.
"While ethnic Koreans make up only 0.5% of the Japanese population, they are a prominent part of Yakuza ... The Japanese National Police Agency suggested Koreans composed 10% of the Yakuza proper"
https://en.wikipedia.org/wiki/Yakuza#:~:text=According%20to%...