That is quite an assumption and I certainly hope it is not based on racial bias? Which riots is it that will "start back up"?
I personally have a good friend in her 60s who travelled 500+ miles to join her adult daughter to participate in a nonviolent march to protest the lack of due process and competent investigation in Trayvon's killing. Yes, she wore a hoodie. Yes, she is white, maybe pastier white than I am.
Justice has no color. Justice does not undo grievous wrongs, we can only learn from mistakes and go forward. That means not repeating the same mistakes.
And finally, everyone's blood runs red. When will the senseless killing stop. Trayvon died for what reason? Because he walked down the street in the rain in the presence of a person who seems to have been over zealous, paranoid, and who was willing to shoot to kill. This must never happen again.