Here is the thing.
Trayvon Martin - black youth starting fight with authority figure and is shot dead.
Mike Brown - Robs a store, picks fight with authority figure and is shot dead.
This is not an emerging pattern, but an axiomatic symptom of misguided youth having issues with authority in that they have no father figures in the home to teach them. In addition, these symptoms have been turned into a disease by people like Al Sharpton who use race baiting as a profession.
Until someone gets in front of this, condems Sharpton as a tool of the left, the killings will continue.