Well, he's in charge of the reapers and who goes where after they die. But he doesn't believe in screwing up someone's life story to kill them sooner and is a firm believer that every action has consequences. Despite what the Winchesters think, he's a pretty rational guy. It isn't like he has an easy job, you know? He told Dean once, in order to do what he does, you can't get attached or really bad, catastrophic things will occur.
