What good did the looting do? That is what I am having a hard time understanding. I get the anger. Just don't understand the leap from being extremely angry to burning buildings, robbing businesses, etc. Did those business owners contribute to the perceived miscarriage of justice? So if Michael Brown really was an innocent victim of police brutality, the solution is to burn down the neighborhood of the very people who are oppressed? Insane.
I think the general issue here is the breakdown of the social contract. The reason we don't steal from people, or destroy other people's things is that we are in a social contract with them - we all live together and create a society. In the view of much of the low-income and/or African American community, the social contract is meaningless when the establishment (in many cases, if not most, the "white establishment") can gun down members of their community and face no repercussions.
As a result, if the social contract has broken down to the point where their lives are not protected or valued, they have no issue with breaching their part of the social contract by stealing, destroying, etc.