ding ding ding!
Copy editors do far more than people assume [1]:
> The dirty little secret of newspaper journalists is that a lot of them can't write very well. That's by no means universally true, but it's true enough. [...] I transformed some real trash into publishable writing, saved my paper and some writers from professional embarrassment, and introduced relatively few errors on my own.
And from the comments:
> Having worked at small, mid and metro newspapers, I can tell you reporters who can't write very well exist everywhere. When I first started working at a major metro, I thought all of the raw copy would be flawless. After all, these reporters were working at a metro daily. But there were plenty of reporters who really needed the old rewrite desk. Some reporters, of course, were very good writers But pity the poor reader if copy editors disappear.
[1] http://www.yelvington.com/content/07-08-2008/death-copy-edit...