Insanity in the courts

There was a man who was rear ended by a woman on the highway who had her dog on her lap, she kept on driving, he forcerd her to the side, took her dog out of the car and trew it into oncoming traffic. He is now in jail and she got off without a single charge. I say this is insanity, under proper provication you should have the right to take the law into your own hands. This includes the killing of dogs when nessessary! She was a danger to all, and I believe her licences should be taken away and she should be greatly fined.