I drive 25,000 to 30,000 miles/year. I've seen a substantial number of incidents that either were the result of road rage... or could have easily turned into such an incident. The attitude displayed on streets and highways, today, mirrors the attitude of a generation that feels "entitled". One of the things that aggravates me is the driver who "parks" in the passing lane just at or below the posted speed limit. It seems as if so many of them feel as if it's their "duty" to keep anyone from passing or from exceeding the speed limit. Of course, quite a few who are holding up traffic while blocking the passing lane are on cell phones. But, that's another subject.
On a 4-lane, I will pass on the right if a driver is holding up traffic while in the passing lane. Sometimes that does result in the driver speeding up and attempting to keep me from passing. Those folks should have their license revoked.
And, there are a few times that I have "taken matters into my own hands"... even though I know it is wrong to do so. If an offending driver is piloting a relatively new or a high dollar auto, they hesitate when my 4WD truck begins to move in their direction. I always signal a lane change, then slowly begin moving to the left. Have had a few honk, but have never had one continue to block traffic.
Common sense, respect for other drivers, and simply courtesy seems to have been lost somewhere along the way.