Make them less willing to help us commit war crimes

Kevin Drum makes the excellent point that embarrassment is the reason why the torture memos ought to be released.

Brennan's argument is that release of the memos might embarrass allies who helped us torture prisoners. He might even be right. But if that makes foreign intelligence services more cautious about helping us commit war crimes in the future, that would be a argument in favor of releasing the memos, not against it.