A wise man once said, "Everyone believes they are in the right until they hear the other side of the story."
They had killed his best friend and someone he loved, and so Chaos saw all Forsaken beings as evil. So he attacked, and he killed, and kept killing until he had to stop and handle other matters.
Afterwards, while he had no memories of his life as Chaos during his subsequent incarnations, that hatred was still there, and so whenever he met a Forsaken being, they died.
He believed he was right to kill all Forsaken beings.
But the narrative had changed now, and Kent, while he could still choose to believe he was justified in killing the Forsaken beings, knew he had made a blunder.
Forsaken beings, in truth, are considered evil because they chose to side with corruption, becoming existences that defy the order of the universe. So, in a sense, they are all bad.
