I totally understand where you're coming from about Sam. Basically, for me, it comes down to the fact that he truly believed he was doing the wrong things for the right reasons and it's hard to fault him for that. And I know that Dean will come to see that. And I know that Sam will come to see that the things Dean did was all about trying to protect and save his brother from going down a dark path. They'll find their way back to each other, I'm sure of it.

they are two halves of an awesome hole.

My sentiments exactly! :-)