random_pr
by partly, I mean that we've found larger genetic links between 'propensity to work hard', and for IQ, than we have for homosexuality.
in the say way, I think we have indeed found some manner of link between genetics and depression, but again, it's sort of a tenuous thing.
wrt. drug-related crimes, sure, there seems to be a weird disparity (does it take into account 'casual' drug users vs. 'hardcore' drug users?).
wrt. violent crime, however, the percent of arrestees who are black matches very closely with the percent of victims who say their assailant was black. and this has been constant throughout thirty years of crime victimization surveys. see here: http://en.wikipedia.org/wiki/Race_and_crime_in_the_United_St... and https://www.ncjrs.gov/App/Publications/abstract.aspx?ID=2560...
you can't say that african americans are arrested at unfair rates. it's more nuanced than that: african americans are probably arrested unfairly for drug-related crimes, but they probably aren't for violent crimes.
unfortunately, I think this is a compounding problem: more african american men in prison means more single-parent households (that are probably also in poverty), which means more crime, which means more african american men in prison.
you can be more specific if you'd like, but it is unnecessary.