Perhaps it's because it's because they're crystal's of God.

[He rubs the back of his neck.]

I don't really know. If you need something, I'll try my best to get it for you. It seems like sometimes that's the best a temporary warden can do. But I guess I'd also say... what do you think it takes to make up for a mistake? Is walking away at the end truly enough? [Because it seems to him that Cloud had said it was enough for Allen, but he doesn't know if he applies that same standard to himself.]