Men who are engaged in public life must necessarily aim at reducing opposition to a minimum, and one of the most obvious means to that end is by misrepresenting, discrediting or ruining their opponents.
It is true that the politician, in his professional character, does not always, or even very often, conform to the most approved pattern of private conduct.
No politician has ever yet been able to rule his country, nor has any country ever yet been able to face the world, upon the principles of the Sermon on the Mount.