Not that I’m defending the attack, wholly unacceptable in any case, but a couple of points made me go “huh?” here:
he gestured for a motorist to stop in Kings Road
So he’s marched out into the middle of the road with his hand in the air in order to stop traffic, because his passage is far more important than anyone else’s?
the vehicle, which had been travelling at excess speed,
… and he also happened to be carrying a speed gun?
Yeah, what a low life. Pity they didn’t kill him, his wife and child.