He needed his solitude at times, but he wasn't a hermit. He did a lot of socializing. Sometimes I think it was like he was storing up company for the times when he knew nobody would be around.
You do what you do - in the circumstances in which you find yourself - because of the way you are. So if you're going to be ultimately responsible for what you do, you're going to have to be ultimately responsible for the way you are - at least in certain mental respects. But you can't be ultimately responsible for the way you are (for the reasons just given). So you can't be ultimately responsible for what you do.