Many victims of race-based prison rape turn to racism and murder to "avenge" their perceived loss of manhood. See:
http://www.alternativesmagazine.com/10/cahill2.html
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That makes alot of sense, if while in prison all of your tormentors are black , and you are in the minority and can't do anything about it ( they beat you and rape you) . Who wouldn't want to extract some payback upon release?