I give tickets for speeding, as well as all manner of traffic violations. How do you know what that person being pulled over on the side of the road was stopped for? I just love it when people assume what they do not know.
Consider that I give far more verbal warnings than written citations, it's likely that it actually costs my department for me to bother to stop people to correct a bad driving habit. Departments, and government in general, do not make money on traffic fines. You have no knowledge of how the system works if you think that.