I think there's some ideological conflict going on here, Eastern people like the Chinese and Japanese fight to the last man- demonstrated during the Japanese invasion of China and when the Americans were 'island hopping'; Western people have an idea of conserving forces by surrendering (and hopefully regain that conserved energy by recapturing the land-sorta like rematch) , demonstrated by prisoner statistics.
It wasn't a fight between a NINJA and a SAMURAI .
hahhahahahahahaa