Editing??
Why not???
If you can make it better for the reader then what reason are you left with for not editing your work.
Anyways, if it's my work, I have every right to do whatever I want to do with it whether I want to keep it or change it!
But when it comes to edit someone else's work, I think it shouldn't be done since the work loses its originality this way. A writer's words are his voice! His work is the way he thinks and perceive things. No matter how badly he writes, it's his personal style and freedom. I don't think anyone should change it!!