I disagree...dangerous aggressive idiots need to be held accountable for their actions, and told that they are unacceptable.
Feel free. I hope you have lots of spare time.
Most drivers who do that sort of thing are chicken-sh*ts when confronted, especially when there are witnesses.
Probably. I just recommend properly weighing your chances before getting into a physical confrontation with someone that has a clear physical advantage, or at least have an escape route. If you must confront someone, better to keep it verbal. If you can remain calm, even better.