This too needs to be studied, and this in some ways it is easier study for you can look at other cities with various racial demographics, poverty / income, but also things like what did various police chief and other actors of specific cities did in various cities.
Aka in some ways this is easier to study for you can have various cross tabs and see if there is intersection between these various variables. It is far easier to prove for you have far more data you just need to agritate the data and then dissect the data with various hypothesis and see if these hypothesis have correlations or other effects seen in the data.