I am sure that I am not alone in feeling that John Yoo should be shot. But what about disbarred from the practice of law?
He facilitated criminal behavior by writing a ludicrous legal argument that encouraged breaking the laws against the use of torture. That is an ethics violation. He facilitated a crime. He knew it was a crime. There was no case law, statute, or regulation that supported his legal analysis.
You can't just come up with a legal theory, waive your hands in the air, and declare a formerly illegal act to be legal now that you came up with some reason to justify it. And as an attorney, John Yoo knew that.
John Yoo needs to be disbarred from the practice of law, at the least. Imprisonment would be better.