Supernatural is the story of two brothers who try to destroy the world.

They started off as okay selfish people who killed monsters on the side as they looked for their father and the thing that killed their mother. Then they started the breaking of seals, succeed in freeing Lucifer, ruin heaven, ruin Cass. Then the trio takes it upon themselves to bring in monsters from Purgatory, help to expel Angels from heaven. Their grandfather sacrifices himself to help get rid of Abbadon they release her just for kicks, decide not to close up hell just as a FU to Kevin before they cause his death. So now to kill a problem they caused, they go and get the mark of Cain, they are fully warned that getting rid of mark would release the darkness but they figure “why not?” and kill death just so no one could scold them. Everything after this point is a big FU to the earth because only Sam and Dean matter. Screw every other human, angel, arch angel, monster, ghost, demon, son of Lucifer, god. That nail on the beam was the best thing to happen to earth since Sam and Dean were born.