A cop taking quite correct and proper measures to stop an abusive, drunken woman from further assaulting him is not “mob justice”. Keeping in mind this person had already ruined the football game for many people in that section of the stadium the reaction of the majority of the fans saying that she got what was coming to her (as quoted in multiple articles) is quite understandable.
There is no moralistic lecture here - the cop is in the right using appropriate and limited force for the situation to stop further harm to himself or others attempting to carry the woman away. The woman is completely in the wrong. There is no moralistic ground here - simply an obvious statement of right vs. wrong.