Sure you do. You understand it completely. Assholes who become cops are still assholes. That's not hard to understand. You can disagree with it, you can be angry by it, but I'm sure you understand why it happens. Antagonizing the police can only end badly. Is it right? No, but lots of shit happens in this world that isn't right. Lots of people who have power will abuse that power. Absolute power corrupts absolutely. What is the gain of doing it though? Does it make these people feel better? It seems like a risk without really any reward.
Obvious answer from my perspective is that most of these folks who do this are 1) have limited emotional control 2) rarely have had to face consequences 3) privileged white people. Add these three things together and you get a Karen and idiots like this guy. But @barfo ’s point stands, we need higher expectations from our police force in this country. Period.