Why one anyone fight a "noncriminal violation" who's penalty was $25? Its a cheap traffic/parking ticket. Court costs would add another $150 bucks, but the DA/ADA probably would settle out of court if it was the only infraction, assuming it made it that far. Furthermore, you have the right to defend yourself, I have done so and it has been a fun/entertaining/learning experience. If I went through law school, the DA said I had a job with him for the taking, plain and simple.
From the cops perspective, why would he go through the hassle of giving you such a pathetic violation unless you were doing something to deserve it? Getting cross examined on the stand is rarely an enjoyable event.