You are entirely missing the point Clownboy. People protest in San Francisco all the time for plenty of stupid reasons and often do annoying things like blocking traffic. If they are too disruptive, they get arrested. None of that is the problem.
What is utterly unacceptable is pepper spraying a harmless group of individuals sitting on the ground. Inflicting physical violence upon another person is only legal as a defensive measure, not simply because you don't like the people in question.