Seriously, if you're a celeb over there and caught smoking a joint, your career is basically over.
Even the infamously prudish U.S. is more accepting of it.
I'm guessing it's a leftover of U.S, imperialism, like how all their porn is still censored.
https://en.wikipedia.org/wiki/Bushido#Contemporary_Bushido I'm sure it's gauche and will get removed like my previous comment, but I'm not kidding. That ethos is still ingrained at the highest levels of Japanese society. Explicitly fascist Japan had to adapt to American occupation post-war, so Tojo's outward callback to samurai ethos sublimated itself into peacetime culture - hence 100-hour salaryman workweeks, children going to juku cram schools, emphasizing stoicism and modesty.