When virtue is lost benevolence appears when benevolence is lost right conduct appears when right conduct is lost expedience appears. Expediency is the mere shadow of right and truth it is the beginning of disorder.
There are no morals in politics there is only expedience. A scoundrel may be of use to us just because he is a scoundrel.
Some people suggest that the problem is the separation of powers. If you had a parliamentary system the struggle for power would not result in such complex peace treaties that empower so many different people to pursue so many contradictory aims.