Your "black people have high crime because of poverty" sounds nice, but it isn't congruent with facts:
1) Blacks have a higher violent crime rate than both whites and Asians across socioeconomic lines. Blacks with a household income of over $85,000 have a higher homicide rate than the lowest socioeconomic strata of whites and Asians, according to the U.S. Bureau of Justice.
2) Crime rates in the US have a startling correlation of 0.81 to the percentage of population that is black., much higher than socioeconomic factors. This is vastly higher than the correlation between crime and poverty (0.36), unemployment (0.35) and lack of education (0.37). Source: FBI Color of Crime, 2005
3) Other groups with an even lower socioeconomic status (such as immigrant groups from Asia) don't have anywhere near the crime rates of blacks in America.
4) The link between the two isn't even that particularly strong. For the years 2006-2011, the Census-ACS provides estimates of the Mean Income, Median Income, and Poverty Rates for each urban center, allowing us to look at the correlations between crime, income and race. The correlations between the Mean Income and Median Income leves and the various crime categories generally fall in the range of -0.30 to -0.60, being moderately rather than strongly negative, usually well below our racial figures:
http://www.unz.com/article/race-and-crime-in-america/
Blacks are only 2.7 times as likely to be in poverty. If you were to create a nation wide crime/poverty index, in which crime rates are adjusted for poverty across states, they would still be way more likely to commit crime.
http://www.statehealthfacts.org/comparebar.jsp?ind=14&cat=1
There are almost twice the number of white people below the poverty line as black people in the US. Using the numbers found on Wikipedia, there are about 9.6 million black Americans below the poverty line and 19.2 million white Americans below the poverty line. So it was true that (irrespective of race) poverty caused violence, then whites would be committing violence at a pace twice that of blacks. But they don't.
http://www2.fbi.gov/ucr/cius2009/offenses/expanded_information/data/shrtable_03.html
Poverty rates are insufficient to explain the differences in crime rate. There are more whites than blacks at every level of income (in absolute numbers), there are twice as many whites in poverty as blacks and yet blacks commit more murders than whites (in absolute numbers).
So we can say with relative certainty that when it comes to crimes like rape and murder which are not committed for economic gain that poverty is not a sufficient explanation.
This is why when we look at places like Kentucky, home to a population that has the second highest white poverty rate in the nation (yet a violent crime rate that is 40 percent lower than the national average)
Appalachia is almost entirely white and the poorest region in the country. We see horrible rates of poverty, yet the crime that plagues Detroit, Norfolk, Richmond, Baltimore, St. Louis, Atlanta, Memphis isn't found.
The 10 U.S. counties with the lowest annual median household incomes are:
1.Owsley County, Ky. – $21,177
2.Zavala County, Texas – $21,843
3.Clay County, Ky. – $22,255
4.Knox County, Ky. -$22,493
5.Wilcox County, Ala. – $22,611
6.Quitman County, Miss. – $22,625
7.Sumter County, Ala. – $22,857
8.McCreary County, Ky. – $23,163
‘Yet, The violent crime rate for Appalachia in 2010 was lower than the national violent crime rate average by 56.76%’
