Sam had a lot of respect for Castiel. He had ripped his brother out of Hell, he was helpful, and he made Ruby happy. But then, right then, he wanted to do nothing more than leap up, wrap his fingers around the angels throat, and strangle him good and proper. What an idiot! Did he not understand how incredibly moronic this was? LETTING a human being die just because she wanted it? That WAS suicide. No - it was MURDER.
Sam slowly stood, running a shaking hand across his face. Then he moved forward and stepped up to Castiel, literally towering over him. He didn't care if the angel wanted to completely oblitarate him. Sam wanted to make sure that he understood how horrible all of this really was.
"If you walked in on this woman holding a gun to her head, would you let her pull the trigger?" His eyes locked with Castiel's own. "Or are you going to push that gun out of her hands and save her life? She might not want it now, but in the future she'll be grateful. She'll understand that death wasn't the way. Ruby or not, this woman is going to die if you keep acting like a moron. Stop being cold. Stop being a damn ANGEL for five seconds and look at what you're agreeing to let happen."