No. No, Castiel could never make up for what he's done and he knew as much. He'd caused so much suffering and he wasn't good, but he didn't see things in the same absolute black and white that he once had. He wasn't bad, either. He was simply guilty of sins, like everyone else.

"We should still have the freedom to make those mistakes and learn from them." Despite his wrong choices, he wouldn't give up his seeming autonomy for anything. He couldn't do it, knowing what he knew and experiencing what he had. Nothing Raphael could say would change that. "Suffering is part of life. It's how we grow. I think He always intended that."