“An armed society is a polite society,” Robert Heinlein opined. “Manners are good when one may have to back up his acts with his life.” Bet you didn’t know about that second part. It applies here. The driver who aimed the gun at the camera thought he could get away with brandishing a firearm because he assumed the brandishee was unarmed. (I assume.) Which highlights the importance of open carry. If the other person doesn’t know you’re armed they don’t have to be polite. If they do, they do. Don’t they?