Of course he knows what he's done.  He isn't detached or mentally unstable or anything like that - any headshrinker will know it's a simple case of childlike arrogance like sticking up your middle finger at the judge as you're being led away.  He's revelling in all the free publicity.  By showing no outward signs of giving a damn, he's hoping people will say: "Ooh, what a hard man."  He thinks he'll be top dog once he gets inside, but the truth is, behind the facade and the big hard guy image, he's probably experiencing what it's like when you have a big dose of Andrews, only he can't show it, and he'll have to play at being the big hard guy for the rest of his life.  Unfortunately though, he'll have an army of Lord Longfords and do gooders vigerously campaigning on his behalf.