It seems that Vanessa is basing far more on a five second clip than the rest of us are. I would say that, IN GENERAL, most of the people here, despite what you think they are saying, wouldn't expressly advocate for that level of response from the male IN A VACUUM. If the cops had literally just come upon the scene two seconds earlier and the slap/flail/hit from the woman happened, and they had no reason to suspect she had a weapon or was more dangerous in some way, it would probably be generally thought to be a bit excessive to punch her like he did. It still would not be wrong, given that he's a police officer and assaulting an officer is in fact a crime, and I doubt any jury would rule against him because she did actually strike an officer in the course of his duties and he had no idea, coming upon the scene fresh like this hypothetical, if she had murderous intent or capacity. But most of us would probably say that yes, he could have de-escalated it better. The important distinction is that he did not have to though.
However, since the five second clip is basically your hypothetical situation, let's do one of mine. What if the full clip painted a much different picture? What if she had been slapping and shouting and interfering for the past 15 minutes while they tried to control the situation? What if they had repeatedly pushed her away and warned her that she was interfering? Would your opinion still remain the same, that a man should only apply just enough force to "control" the situation? Whichever answer you give, why do you give it?
If you remain steadfast and suggest that there is no reason given in my example to strike her that hard, would it have then been better if he engaged in a slap fight with her? Would that help or hinder the situation, do you think? Would that "control" her, or would it just anger her further and suggest to her that she can continue her behavior? At what point does he get to stop having his slap fight and finally punch her if she keeps it up? At what point is she exceeding her "gender/body type" level of aggressive response? From what you are saying, there is NEVER a point at which she would reach that, if she never goes beyond what we've seen in the video, even if it goes on for a long time. If that's a misstatement of your opinion, then please explain. Because that would, in most of our eyes I think, be hypocritical of you. Maybe I misremember your posts too, but I think that's what you are saying, that unless she escalates her level of violence, the man never can. Regardless of duration.