I have been many in similar situations, and must say I've been quite disturbed and saddened by the actions of some police officers.
As you have been in many similar situations, are you not equally saddened by the actions of some protesters against people who are going about their lawful duty? You appear to be totally discounting the weight of evidence which says that the policeman was justified in his actions because it doesn't fit with your perception of reasonable force in policing. The fact that this was a small woman is entirely irrelevant. As for your assertion that he is a cowardly bully, I observe the police at fairly close quarters on a regular basis and I'm sure that given the choice, most would prefer a 'football hooligan' to a small woman who may or may not use a can/camera as a weapon.
Presumably you are not a racist, unfotunately I missed out the question mark when I said that, you are however incredibly narrow minded and refuse to see the situation from another perspective because it interferes with your political beliefs and apparent indoctrination that all police are evil thugs.