It is boring to haunt a writer, and even more so to haunt a celebrity. I would haunt a literary figure! Possibly some superhero, maybe even James Bond. Constant adventures, fights, beautiful women--much more interesting that watching a writer who taps on computer all day long, or a celebrity posing in front of cameras.
There is no abstract Evil; you have to understand that! Its roots are here, all around us, in this herd that goes on chewing and having a good time only an hour after a murder! That's what you have to fight for. For people. Evil is a hydra with many heads, and the more of them you cut off, the more it grows! Hydras have to be starved to death, do you understand that? Kill a hundred Dark Ones, and a thousand more will take their place.
Evil has no need to bother with eliminating Good. It's far simpler to let Good fight against itself.