Dean was glad he didn't pry. It made him a little uncomfortable, too.

"Well, I don't consider it murder to kill someone who's trying to kill me, but I guess it's possible to see it that way." He frowned and shrugged, not really comfortable with the implication, but he didn't really want to fight with his brother. "Also consider that they're dealing a drug to people that can make them go apeshit and start killing people, too."