The writer's point was that revenge is a fantasy borne of helplessness, and by its nature loses a lot of its appeal once you're actually in a position to carry it out.

See: Nelson Mandela. And not the liberal idealised peaceful grandpa version of him, but his armed struggle against apartheid from the beginning to when he became president.

"As I walked out the door toward the gate that would lead to my freedom, I knew if I didn't leave my bitterness and hatred behind, I'd still be in prison... Resentment is like drinking poison and then hoping it will kill your enemies...You will achieve more in this world through acts of mercy than you will through acts of retribution”