> Supposedly the Japanese during WW2 also resorted to cannibalism.
Germans and Russians did too. Most humans with a survival instinct will turn to cannibalism if it their only means to survive. This is completely unrelated to cannibalism as a cultural practice.
Apparently cannibalism after sea disasters was considered acceptable, as long as there was a fair lottery!
https://en.wikipedia.org/wiki/Cannibalism_at_sea