Absalom has nursed his grievance into a plan, and he serves the murder to his men dressed as bravery. Watch how carefully evil borrows the language of virtue. He tells them to be valiant, to fear nothing, as though butchering a defenseless drunk were courage rather than its exact inversion. Resentment arrives wearing the mask of justice.
The most dangerous cruelty is the kind convinced of its own righteousness. A man who admitted he was taking revenge might still hesitate, but one who believes he is being brave will not stop. Atrocities get committed by people persuaded they are the heroes of the story. The mask does not only fool the servants. It fools the one who put it on.