One must also consider that it isn't the density per se, but the populations. For example, you could compare two equally dense areas but made up of different population groups. You would find a difference.
The problem here is knowing what really is the cause and what is the effect.
It is well known that, in the United States, drug usage between all races tends to trend roughly the same. However, the arrest rate for blacks is much, much higher. See these charts for marijuana.
One possible explanation, of course, is indeed that blacks are more likely to be arrested while committing another serious crime. Hence the gap.
An alternate explanation reverses the argument: blacks may be more prone to commit serious crimes because they are more likely to be arrested for trivial crimes like marijuana usage. Prison does have social consequences after all (eg, people are less willing to hire someone with an arrest record; prison can establish contacts with underground economies that are more likely to utilize violence to settle disputes; prison can tear apart families; etc. -- http://www.economist.com/node/708550 ) and since America is not keen on reintegrating criminals into society (a very high rate of recidivism compared to most countries -- http://www.salve.edu/sites/default/files/filesfield/document... and http://www.businessinsider.com/why-norways-prison-system-is-... ), it is very possible that early arrests for modest crimes lead to later arrests for worse crimes later.
What is often missed in these statistics is that 90% of the homicides committed by black citizens are committed against black citizens, so it's not surprising that blacks are overrepresented in homicide statistics since they are overrepresented in poor income neighborhoods where all the problems inherent to poverty exacerbate the cycle of violence.
Controlling for poverty does not remove the effect where blacks commit more crime than whites.
> As a means to assess these possibilities, I estimate separate regression equations for the black and white block groups in Atlanta. [...] Consistent with previous research, percent black retains a strong, significant effect on violent crime net of the effects of other controls. [...] Although this finding appears to provide partial support for the racial invariance assumption, the fact remains that for a large proportion of the black neighborhoods, the effect of disadvantage on violence is weaker than is the effect evident among all of the white neighborhoods in the analysis
> More white people than black live in poverty, yet blacks commit crime at far higher rates. For statistics see FBI and DOJ crime data:
1 in 10 whites live in poverty compared to 1 in 4 blacks so it's not true that more whites live in poverty (unless you're talking about absolute numbers, which doesn't tell us anything meaningful in a comparison to the black crime rate).
> Discrimination appears to be indirect, stemming from the amplification of initial disadvantages over time, along with the social construction of "moral panics" and associated political responses. The "drug war" of the 1980s and 1990s exacerbated the disproportionate representation of blacks in state and federal prisons
> Blacks, and to a lesser extent Hispanics, suffer much higher rates of robbery and homicide victimization than do whites. Homicide is the leading cause of death among young black males and females. These differences result in part from social forces that ecologically concentrate race with poverty and other social dislocations.
I agree that the topic could use more good science and research.
> So poor blacks kill each other in huge numbers, and poor whites don't. What's your point exactly?
90% of black murder victims are killed by black perpetrators, 84% of white murder victims are killed by white perpetrators, so I'm not sure why you suggested that poor white people don't kill each other. My point is that the higher black on black homicide rate is what we'd expect to see for a population that is disproportionately concentrated into densely populated low income regions, which will push up their representation in overall homicide stats.
> Also, maybe you missed the black on white numbers which are off the charts compared to the inverse
What exactly does off the charts mean?
13.6% of white murders are committed by black people, 7.6% of black murders are committed by white people, so yes, blacks murder whites at a higher rate, that is clear, but what is your point?
http://www.infowars.com/black-crime-facts-that-the-white-lib...
One must also consider that it isn't the density per se, but the populations. For example, you could compare two equally dense areas but made up of different population groups. You would find a difference.