Could be Korea lights the match.
Very possible. Another scenario: SEIU thugs, in their 'enthusiasm 'for Dear Leader, cross the line and kill someone in a spectacular manner. Won't be a big step from protest/intimidation on the front porch to lynch mobs and Molotov cocktails.
Datapoint: no arrests and not a word from the MSM on last week's little incident. That's more telling than anything else.