They do. It's pretty fucking obvious here. He wasn't acting in accordance with any law. Hell, he probably doesn't even have a badge on! In this engagement he's just a guy with a vest, a gun and a mask.
If I were to glue "Police DHS" onto a vest, step in front of a car and execute the driver I would be in fucking jail. Assuming I wasn't already killed by a panicked bystander. There is no "self defense" plea for me. It doesn't mean jack shit if I thought I was making a citizen's arrest. That is exactly what happened here.
We should be holding LEO (if you want to call these thugs that) to a higher standard than a civilian driving home from school. Period. Would you be defending these actions from an off duty police officer? Because that's what he was in the most optimistic light: a guy with a gun and a mask.
Don't answer, we already know you're a groveling boot licker. I hope that pays off when they're kicking in your door, shooting first and asking questions later.
Edit: for shits and giggles, look up the actual legal basis for self defense. It doesn't apply if you start the engagement (e.g moving to block someone's car) or if the force used is not proportional to the threat (e.g a car moving forward at 2 mph and braking vs 4 gunshots to the head).
His response to the threat was not even going to ensure his safety ffs! A car with an incapacitated driver is just as dangerous (to you and bystanders) as a car with a hostile driver. Did you not see it speed off into a telephone pole? That is the textbook reason why field manuals prohibit doing it.
No defense of this holds up to any scrutiny unless you're determined to shut your eyes and ignore reality.