I do not agree with what a cop did, what can I do?
First of all let me say that most cops do what the City, State, and Federal government require them to do. There are times that the officer might not even agree with what has to be done, but he is required to do it. Probably the best thing you can do is go talk with the officer who you have a disagreement with or the Chief. Tell him or her what your disagreement is, in a civilized manner, and let him explain why they did what they did. Believe it or not cops are human too. The officer might have made a mistake.
If you still don't understand you will probably have a court date, and can talk with the judge.