I agree with a lot of what you say.
My issue with this was that the police arrested a bloke and not the police officer. It now goes to trial and everyone has their say. Good.
I would disagree where you say about its effects on him though. He should be very aware of what he did and it should be affecting him. Even if it turns out he was justified, which let's be honest is a long shot. I agree that he shouldn't be hounded on social media but that's different to the video not being posted.
The alternative is that someone isn't affected by splitting a kids skull open.