The only thing that I can think of that can "redeem" Sam is that he really WASN'T Dean's Sam anymore, and I'm not talking about the siren influence. He did have that demon blood in him after all, and a switch has been flipped somewhere, and he's already on his way *there* if not already there. I think the moment he used his powers in 'I know what you did -', the Sam that we knew is gone.
Interesting that you bring that up because if Sam would think about Ava and Jake he'd realize that the more he uses his powers the deeper in he gets. He's getting so high on his own abilities that he's losing the capacity to judge right from wrong...if the writers really want to go all the way with this I think it'll be great but they can't be wishy-washy about it. They can't decide that of all Azazel's kids only Sam can fully develop his powers and still remain himself, remain good. Can't have your cake and eat it, guys.
I'm actually wondering if something happened when Lilith tried to kill Sam at the end of S3 and wasn't able to. Maybe she inadvertently flipped the switch herself.
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Well, the others didn't have a devoted, self-sacrifying big brother to look out for them!
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