You’re contradicting yourself. The only thing he was defending was the microphone, not himself, and he made two downward moves with his left arm that shove her arm down to break her hold on the mic. That is the definition of aggression since she was not striking at him.
You can’t maintain that two opposing premises are true. Either she was rightfully trying to take the mic back and he aggressively knocked her arm away or he didn’t. If he didn’t then why would security have to intervene?
I’m not contracticting myself. I do not think her job description entails (like an SS agent’s might) “Take them DOWN if they don’t do what you ask.” So while she was right to forcefully go for the mike at first, if the reporter didn’t give in, she probably didn’t know what she should do, and the SS is probably supposed to step in if bodily force is called for.
And politically if the SS take down a CNN reporter, no one will talk of anything else for 23 weeks. The President has a Stasi, etc.