It's Not Me It's Them

I arrive at an intersection at which I have to give way. In the middle of the intersection, facing the wrong way, a large 4wd with a trailer is stopped. I wait. The driver of the 4wd - a man - starts to gesticulate violently. His face is red. 'Go around' he screams at me then throws his hands in the air. Lordy, he stops for a rest in the middle of a busy intersection and suddenly he's expected to spell out the ways of this cruel world to every wet eared rube that wanders past. Clearly upsetting for him.

I seem to regularly encounter arseholes like this and it makes me wonder: is it being in a car that makes them so, or is it a committed life choice?