what does perry say that suggests he feels no remorse for the crime he participated in?

From the text:

Cullivan probed, trying to gauge the depth of what he assumed would be Perry's contrition. Surely he must be experiencing a remorse sufficiently profound to summon a desire for God's mercy and forgiveness? Perry said, "Am I sorry? If that's what you mean - I'm not. I don't feel anything about it. I wish I did. But nothing about it bothers me a bit. Half an hour after it happened, Dick was making jokes and I was laughing at them. Maybe we're not human. I'm human enough to feel sorry for myself. Sorry I can't walk out of here when you walk out. But that's all."