Why not indeed? Of course people should honor their oaths. And some of them probably fully intend to on the day they first make the oath. Then life comes along and puts them under various pressures and inducements...specially in politics...things change, and they waver. What worries me in politics is that some of them are so cynical that they make the oath, fully aware that they will one day break it. If so, they're just keeping up outer appearances and going through the motions.