They can do ill-considered, wreckless things. In driving, people can be very selfish, rushing by others to make some appointment. As Christians, we don't have to like such bad behavior. We can feel anger about it. But we don't have to react to such behavior in destructive ways, as if our entire worth as a human being were at stake.
Angry people tend to forget that other people are worthy of consideration too.
Seated behind the wheel of a car, controlling a powerful engine, with a loud stereo pumping sound into our ears, there is a tendency to be insulated from other drivers, and to treat them as objects, not as human beings who are precious to God, just as we are. The fact is, it's easier to take our anger out on objects, than on people. In the heat of anger, this professor honked his horn repeatedly at the oncoming car. But then his demeanor changed dramatically, when he suddenly realized, upon getting closer, that the oncoming car was driven by his friend. As Christians we are called to respect all human beings, and not treat other people as mere objects.