If those people were intelligent (they're not), they'd recognize that while those men are black, their crimes are derived from cultural and socio-economic differences. Basically, America never fully integrated them and our differences have lead to a sort of tribal warfare among the afflicted population.
It may not be any different for American whites if we lowered (and we are) our socio-economic status. I truly believe that if push came to shove, any segment of our population could be as dangerous and violent as those people in Chicago. That may be hard to appreciate given our cultural heritage of wealth, leading us to better education and opportunities, but take away that heritage by breaking up our families and we can be pretty freaking monstrous as well.
For example, look at Mexico. Their tribes (drug cartels) are bigger, more powerful, but the violence there is quite palatable and should be compared to Chicago. This isn't an issue of any single race, but a general condition of humanity. Under the right conditions (Post war Iraq) we are little more than brutal, savage animals.
If we simply gloss over the human condition by only looking at people's skin, and ignore the root causes, we're going to find ourselves repeating our mistakes and never actually addressing the violence which plagues us. We need to study tribalism, we need to learn what makes it tick, and how to beat it. We need our people to learn that it's the human condition that is our enemy, not each other.