Bela
It's hard for him to not do that. Between you and me, Dean was put in charge of Sammy when he was four and hasn't stopped since. I'm not bad mouthin' their Daddy he was a great man, just sayin' that it's kinda hard for a leopard to change it's spots.
You could always try spankin' him. He wouldn't be worryin' 'bout blaming himself then.