I think I need you to explain more what you mean about that. Just that Dean kills other supernatural entities, but not Sam? That's certainly true. If Sam hadn't been Sam, Dean would've killed him in early S4, and Dean said as much himself. And I don't know that that ever fully goes away. Even in S7, it's disturbingly easy to read the killing of Amy as a symbolic killing of Sam. But I think that Dean's motivations are pretty straightforward: fuck morality, he's not killing his brother. And really, the same suspension of the normal rules applies to Cas--he killed hundreds of humans when he went Godstiel, not to mention the thousands of angels, and Dean's still all "you're family! I need you!" Anyone else would have an angel sword through his chest at this point. That's just human nature at work.
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I think I need you to explain more what you mean about that. Just that Dean kills other supernatural entities, but not Sam? That's certainly true. If Sam hadn't been Sam, Dean would've killed him in early S4, and Dean said as much himself. And I don't know that that ever fully goes away. Even in S7, it's disturbingly easy to read the killing of Amy as a symbolic killing of Sam. But I think that Dean's motivations are pretty straightforward: fuck morality, he's not killing his brother. And really, the same suspension of the normal rules applies to Cas--he killed hundreds of humans when he went Godstiel, not to mention the thousands of angels, and Dean's still all "you're family! I need you!" Anyone else would have an angel sword through his chest at this point. That's just human nature at work.