Anyone who works any job should act like a professional while on the job. Part of professionalism is the maintenance of one's personal ethics. A government job is just like any other in that a person should conduct themselves in a serious manner.
In terms of the politics. That, I believe, should simply be a reflection of the desires of the population that the government represents. If people want more government, fine, if they want less, fine. Whatever the government does has benefits and drawbacks (meaning there are certain benefits in having a large government and other benefits in a smaller one, the same with drawbacks), but it should be up to the population to soberly and thoughtfully decide what is best for themselves and for the country as a whole and vote or petition the government accordingly.
If people are honest and considerate, than the ethics will mostly take care of itself.