With what you lot have done over the centuries, being brainwashed and memory-wiped is kinder than remembering what you've all done. Demons don't have the luxury of ignorance.

[Crowley knows more than he lets on -- mostly because he was there, for part of it.

But his tone shifts from seriousness to a bit more amused.]

Though she is attractive.

[He'll let the Winchesters go, for now, in favor of torment.]