Well, why shouldn't he.
As an upholder of the law, he above all others should abide by it, he should set the example. He was taking the piss and he got caught, therefore he should have been made an example of the first time around. If this guy has, as people seem to assume, been trained to drive at 159mph then he should be more than fully aware of just how dangerous that is on public roads and how disastrous an accident at this speed could be.
By dismissing this guys case it makes a mockery of our legal system and just makes peoples trust in the police and the judiciary lower than it already is.
In short, this person has shown gross disregard for the rules that he himself should be enforcing, he was fully aware of how dangerous his actions were and finally I hate traffic cops, so SEND HIM DOWN!!!!!