there are, of course, variables which need to be statistically accounted for before a summation of the data can be made such as; per capita crime rate, socioeconomic status, race, and others that are "controversial". It is a well known fact that blacks commit more violent crime per capita that other races in the united states, is this "controversial"? why? because of race? is it not a well known fact that races are different? isn't that why they are called "races?
There is also an unfortunate occurence called the "cinderella effect" by evolutionary psychologists that says stepparents will not treat their stepchildren as well as their own children and will treat them with less than favorable affection. Statistics prove this as well, determining that step children are up to 40x more likely to be mistreated and killed by a stepparent than by a bilogical parent.
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