You're getting down-voted because you are trying to stereotype all truckers as aggressive, dangerous drivers. The author stated at the beginning of the piece that the trucker specifically got flipped off because he was taking too long to pass another truck. You are assuming a totally different case, where a trucker gets flipped off because he has just swerved into your lane.

You're right, work is hard, and perhaps truck drivers don't deserve our sympathy. But, I do think that we owe them common courtesy and respect as they conduct their business on our highways.