Let's break this down and see who is REALLY the aggressor...
Driver A is puttering down US-1
Driver B pulls up beside him and calls him a slowpoke, and makes some hand gestures.
Driver B passes, then pulls off to the shoulder.
Driver A pulls off behind him and gets out, shouting and gesturing.
Driver B exits vehicle with gun in hand.
more shouting, and waving.
Both drivers leave the scene.
Driver B follows Driver A and parks in the same parking lot, wearing gun in holster.
Police are called.
MISTAKE 1: The slow driver should have NEVER pulled off behind the screaming, speedy driver.
MISTAKE 2: The armed driver should have never exited his vehicle when the other guy pulled off behind him--he should have just pulled away and scooted on down the road.
MISTAKE 3: Driver B should have never unholstered his firearm before he was threatened with deadly force (which never occurred from Driver 1 according to the report, but that is still pending investigation...)
MISTAKE 4: Driver B should have never followed the slowpoke to his home/business/whatever.
MISTAKE 5: Driver A should never leave his home without being armed...
What we have here is TWO goofballs--one with a gun, and one who drives like a grandpa--and a little too much testosterone on BOTH sides of the equation. Luckily nobody was shot or injured.
Both people were aggressors. Both are at fault. Both attempted to escalate the situation, and "flex their muscles". Both APPEAR to be short-tempered a$$hats with chips on their shoulders. Neither should be trusted to operate a motor vehicle on a public highway, IMO...
Some people probably shouldn't be carrying. And likewise, some people probably shouldn't be driving. From the sounds of this report, I think BOTH people involved fit BOTH classes...