Regarding things like proneness to addiction, willingness to work hard in school, predilection to commit crimes ... even scores on IQ tests ... it's a mistake to look solely at the individual, even at his genome.
Look at the society the individual has been raised in, its rewards and punishments, what it takes for granted, its heroes and villains, its attitude to gainful employment, etc.
Where are the Chinese homeless? They used to have a big opium addiction problem ... what happened?
The US has a murder rate of about 6.5 per 100 000, just behind Afghanistan and tied with Tanzania. China has one of 0.5. Those Communists, lagging behind, as usual.
Also: w.r.t. 'averages' -- we need to look at distributions -- the standard deviation, for one thing, assuming our stats are what they called 'normally distributed' -- not just means. But the really illuminating thing is to see how other collections of human beings handle these problems.