it is very simple and wildly unpopular why you will find more rioting in the hoods, but it shouldn't be dismissed. Generally, you are going to find a certain type of individual in the hood with certain types of behaviors. This propensity towards certain behaviors like impulsiveness, lower levels of education, glorification of thuggery and any other primal behavior generally also lends itself well towards group think and mob mentalities as well. You throw in the opportunity to thieve under the cover of hoards of people in a population more likely to take part in criminal behavior and voila...
When you take out the criminal element, you generally have throngs of very uneducated people who have a very warped sense of reality that they develop based not on how the world really works, but how their appointed leader of choice has told them things work and based on their own twisted sense of right and wrong from living in a crappy area around thieves and liars for so long. What you see out of this group is a lot of people who generally take no responsibility for their part in their own or their community's mess and even a big dose of 'just don't know better' peppered with "I'm gonna do me". What always got me about liberals making fun of country bumpkins is an urban kid is just as much of a naive(about the world) bumpkin too. Many people in a very enclosed urban center have not even left that center for anything else. When you are that isolated, whether by choice or circumstance, you have a very narrow view of the world, and imo, are very easily led by that which makes you feel secure even if it's totally corrupt and vacuous.
