Power corrupts; deal with it.

(The opportunity to abuse) power (without consequence) corrupts; absolutely.

There is nothing we can do to immunize politicians public servants against temptation. For as long as there is power to abuse, there will be those who will yield to the temptation to abuse it. It is human nature. You can't protect people from their own lack of moral courage; you can't give them more.

You can however, make it impossibly difficult to abuse power
without getting caught.

Government can be made transparent enough, to make it
virtually impossible to conceal corruption and incompetence.

Casinos and banks address thievery, not by hiring extraordinary human beings, but by hiring ordinary human beings, and then making it impossibly difficult for them to steal without getting caught.

Why do you think think security cameras are always in plain view? They're temptation eliminators.

The answer to public corruption and incompetence is transparent accountability to meaningful standards of conduct and competence.

Transparent accountability will be fatal to corruption;
100% accountability will be 100% fatal.