There is much evil in politics today, but it can be easily recognized as it casts past sins at its opponents. Evil does not understand grace, and so it will not extend grace to others.
Immature people who have not truly found God will rear their ugly heads and point out the sins of others, for they do not realize that those who find God turn away from their old selves. Jesus said, "Let him who is without sin cast the first stone."
He knows that those who understand grace and mercy will not do so, for we are all sinners.