If you drove away to call the police that is acceptable. However, the Tony Stewart option resulted in the death of the other driver. You would be hard pressed to justify that.
Only if my intent could be proven. I'm not going to hit the guy on purpose but if I swerve to avoid him and accidentally hit him in the process, I have witnesses proving the other person was being aggressive and belligerent and I was simply trying to get my family to safety.
Unfortunately, the legal system now only notices the race of the bully and the victim and chooses who was right based on ethnic sensibilities.