Of course revenge is sweet, just ask Thucydides
Research has revealed that petty acts of revenge yield considerable gratification. The best commentary on revenge is that of Thucydides in his account of revolutions in Corcyra (Corfu) in 427 BC, in which pro-Athenians were fighting pro-Spartans. Revenge, the historian tells us, was more important even than self-preservation, while pacts between enemies were made merely to overcome temporary difficulties. He observes: ‘It is entirely acceptable in dealing with adversaries to claim satisfaction of the anger in one’s heart in vengeance upon the aggressor, while that retaliation upon enemies which will be possible for us is probably the greatest satisfaction of all.