I just lost a friend today so I may not be as together as I'd like for this.
But someone needs to run hell. There will always be darkness in the world, there will always be evil. And maybe Crowley can keep it balanced, he seems to make his deals with some level of transparency, people call him, not the other way round, and frankly if you walk into a deal without having some idea of what you're doing then maybe you shouldn't be messing with things you can't understand.
Hell isn't up to us.
What is up to us is first off stopping Lucifer, and then making sure the darkness, whatever comes after, doesn't envelop everything.
I know what I'm talking about with this, Crowley knows that too.