Not sure what you're asking there, but that's another example where we don't know what happened. You cite "road rage" because the media calls it a "road rage killing" but last we heard they still didn't know what the actual motivation was. Violence on a road labeled as "road rage" has a very specific connotation and in this case was completely made up by the press trying to make it look like a random John Q. Public with a gun goes nuts because guns just do that to people's minds.

"Road rage" as we use it in the zeitgeist/lexicon may or may not end up being what happened (if it was, the press got lucky because they are flat out guessing at best and outright planting stories at worst) but we do know that the authorities are looking into another case for the same suspect where a police officer was ambushed in what appeared to be an extremely premeditated thrill kill in another state over a month ago and that had absolutely nothing whatsoever to do with "road rage".

Gotta love the lamestream media.