I think its a release to get upset about stuff in fiction, because it is (only) fiction, and you have no power over it. If you (one) got upset about all the really bad things in the world today, the ones you can do very little about, it just makes you upset AND frustrated that you can't stop it, because, its in the real world, and it should be solvable, but you can't still can't usually do much about it.