I'm very well educated and I'm actually from the area in question. The majority of my friends are from the demographics mentioned. You apparently have never spent any time in a ghetto.
The fact is that despite the fantasy that people put up about our country actively trying to put down minority groups, the bare reality is that there is not a single mechanism in existence that does that. If you've ever made a trip to a shitty neighborhood -- kind of like the one that I made last night to spend Christmas with my friend and his family -- then you've realized that these are neighborhoods built on a foundation of subsidization. People live in subsidized housing with subsidized utility bills eating subsidized food, paid for by Joe Taxpayer.
If you're really going to cite the economy and the government as reasons for the perpetuation of crime in minority neighborhoods, then you need to step back and look at what you're saying. The government does almost everything within its means to provide aid. In fact, I was doing community service for Public Counsel in LA informing homeless people and other welfare-recipients of their legal rights. As apart of my training for doing this, I was briefed on every legal aspect of the social welfare system as it exists in Los Angeles (and from my personal experience, basically the same way that it exists in NYC). So if you're going to tell me that I'm misinformed about the political or economical aspects of poverty, then you need to sit there and think for a minute. I was born and raised in NYC, now live in Los Angeles and have worked as legal aid at a benefits office. I'll let you decide who's more qualified.
On the topic of the sociological aspects of crime and poverty, community attitudes are one of the largest contributing factors. People don't like to acknowledge that because they like to live in a fantasy where people don't make decisions and are really helpless perfect people under everything. Unfortunately for them, and you, they're wrong. Half of the dealers that I've encountered live at home with their parents or children and sell drugs out of their houses. This is enabled by a societal acceptance of that behavior. Now, don't get me wrong, I'm not saying that that makes them any less of people, but the bare fact of the matter is that this particular attitude enables crime. In this specific example, the crime is drug dealing, however other attitudes exist.
A lot of it has to do with a lack of education. For example, more educated people resolve conflicts differently than less educated people. More educated people talk things out, less educated people will tend to get more physical about it. When you have a society that often does not encourage (or sometimes outright discourages) education, then crime will likely rise.
I'm not going to give you a full and waterproof answer in one post, but I think this paints a gist of the picture.
The fact is that this article is a very good example of create-a-problem-where-there-is-none journalism. People get arrested more where there are more police. There are more police in places with more crime. There is more crime in places with lower living standards. Places with lower living standards tend to be populated by minorities.
Thus, more minorities will be arrested. Simple shit.
Blaming minorites is wrong. Blacks and hispanics are not inherently bad people. It would be ignorant to say so. In the right circumstances, they are equally sucessful and prominent as anyone else. But claiming some sort of massive attack on the human condition in a statistically sound situation is equally ignorant.