An ethical person - like a politician, banker or lawyer - may know right from wrong, but unlike a politician, a moral person lives it.
"Marx and Engels never tried to refute their opponents with argument. They insulted, ridiculed, derided, slandered, and traduced them, and in the use of these methods their followers are not less expert. Their polemic is directed never against the argument of the opponent, but always against his person." - Socialism