The proper order of events probably wasn't accurate in the MSN story. It probably went something like this.....
1. Pickup driver angry over lot in life, sees biker on narrow 2 lane road.
2. Pickup driver decides to teach biker a lesson for slowing him down 300 milliseconds, drives as close to biker as possible.
3. Pickup driver yells "git off da road, %&
[email protected]#".
4. Biker feels threatend by PU driver's obnoxious behavior, and delivers the middle finger salute.
5. PU driver takes offense to outcome of situation he provoked, and drives directly at biker.
6. Biker, having had enough of red neck boorish behavior, defends self from attemped "vehicular manslaughter" by shooting PU driver.
Of course I may be wrong.....bu I doubt it.