As to their presence there, I wouldn't have been there. I would have been in the comfort of my own home with people I cared for. I wouldn't want to be in the mayhem of the streets and I wouldn't want my anger to push forward an already tense situation to the brink.
What was going through their heads at that moment, I do not know. But when the stepfather said those things, it was of course over the line and he is lucky that the politics of this are such that he wouldn't be punished.