its sad because they a both so alone. Everyone they ever loved is gone. No Dad, No Bobby, their family if they even still have any left that know whom they are would probably kill them and the people that they use to trust they can not fully trust anymore including eachother. They have no other hunters to relate to because NO ONE except them have been through or seen what they have seen and if most hunters could, they would try and kill them. They can not even be nostalgic and consult “dad’s journal” because they are far beyond what dad ever was. They can not risk reaching out and creating a life apart from one another, apart from hunting because when they did, when they both did, It all came tumbling down so horrifically, and everyone the touched died or could only live by being made to forget. They could never go back to a “normal” life or have “normal” friends, they both would probably reject the idea because they are too hurt by the past, their souls just could not except the idea as even being a possibility. No wonder why Sam was ready to die and end it all… No wonder why Dean could never let Sam die and end it all …The closest thing they have to “friends” now is an outcast, outlawed, maverick angel that might just be a tad bit more messed up than them and a devil that once was thee devil, who is trying to get his kingdom back; whom is more screwed up than they are but somehow makes it work . All they truly have is eachother. Sam looks at Dean and probably says to himself, “You’re the only reason why Im alive.” Dean looks and Sam and probably says to himself, “You’re the only reason why Im alive.” The tragedy is, that for the first time maybe, they dont mean the same thing. This must have been what it would have been like to watch Remus and Romulus argue about on what hill should they found Rome, or what it would have been like to watch Cain and Able argue about why god favored one and not the other, or even what might have led up to one brother joining the army of the south and the other brother joining the army of the north. This is why we watch supernatural. This is good writing. I just hope this whole season isnt one big foreshadow for one killing the other. We know how all these stories pan out.