I'm not saying that Sam is right in what he's doing. I'm scared for him, too. It can consume him, it's a demon blood after all. But people (and Dean) should also understand that there are people who essentially wanted to do good, and it's in their humanity even though everything around them is telling them otherwise. Say Robin Hood, say Ned Kelly... yes, these two do bad things for the good of others. Sammy is trying to do something good out of something bad. You must give props to the boy instead of hate and passing judgment too quickly. We must give the boy a break, he needed it!