True. The difference is, the police are meant to be better than the other side. As much as it seems like a double-standard, it is entirely true to say that the poor behaviour of one police officer reflects badly on the whole force in a way which is not true of a protester and the protest. The machinery of the state is simply held to a higher collective standard; that is the price of our consent to their monopoly on violence.
And, of course, then you get into the issue of the police knowingly provoking protestor violence...
Well, what I know is that nobody actually got killed, maimed or made to eat
haggis vindaloo, so perhaps the latter?