Blacks at 12.6% of the general population constitute 60+% of the prison population. According to the Bureau of Justice Statistics, one in three black men can expect to go to prison in their lifetime.
About 5% of the total population - young black men - commit over 50% of the homicides ..
If blacks make up 12% of the population, with about half of those are female, some are small children, and older who don’t commit as many crimes.
http://www.freerepublic.com/focus/f-bloggers/2871673/posts?page=25#25
Ok I have no idea the statistics. But if what you say is true, 1 in 3, that is 33% and not 80%. Also you said “in their lifetime.” So that does not mean 33% of black men are criminals at any one time. And all those crimes are not violent. So the number are lower than 33%.