Hal was never going to be able to reject the guilt. Even when he'd first learned that Parallax existed as a separate entity, that it wasn't all him all along, that didn't change the fact that he felt responsible. He'd let it get a foothold. He hadn't questioned the ways he'd been changing.

He'd still acted; Parallax had simply taken off his emergency brake.

"I'll never make up for what I've done. I know that." He exhaled slowly, spreading his hands. "But all I can do about that is keep trying. Be the Lantern I was, not the villain I let myself be. I can't undo what I've done to you, but I can keep it from happening to anyone else."