User blog:Winchester7314/Possible plot-hole, or maybe a deep hidden reason?

Ok, not sure how many of you this has occured to but think about what Death said in Meeting in Sammarria "Souls can be blugeoned and tortured but never broken, not even by me". Now think about the fact that demons are all human souls, tortured and twisted, but nonetheless souls. I guess now that I think about it there was another plothole in What's up Tiger Mommy, when the pagan god said crowley doesn't have a soul, but that's beside the point. Anyway, how is it that demon's can die, forever. If their human souls that shouldn't be able to happen? LOL I guess plotholes are bound to happen when you try to explain something noone can prove on the supernatural and religious level! lol Is it a plot hole, or maybe a reason to bring back some big baddies(azazel, alastair, ruby, lilith, meg)?