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What? [Dean is not hearing this.] First you say you can't help, and now you're telling me not to even bother? I don't give a damn if I'm stuck like this for the rest of my life, but Sam can't go on like this.
He's...He's not even a person anymore. He's Robo-Sam! He can't feel and he doesn't give a damn about anything. He's the--[stopping right there]--my brother.
He's my brother and I can't leave him running around when I can't even be sure he won't try to kill me tomorrow just because it sounds more practical in his head!