Now seriously, it's the culture, the culture a person is brought up in. Culture has a very strong influence on people's lives, even more so than religion per se. Culture can make a seemigly perfect gentleman act like a total beast in certain situations. Influence of culture on a person's life is so pervasive that it can mold his character in a way that nothing else can. Remember, Japanese used to be suicide bombers, but now they are totally different people because they no longer live in their old culture that glorified violence...