I would argue that passing insecure systems off as secure, like what we saw with Tesco today, would count as unethical. That's a case where you can cut corners and nobody might notice for a while, and the system in question seemingly works.
Moreover, journalistic writing is very public. Your byline is attached to a piece that was seen by at least a few hundred, if not hundreds of thousands of people. If you get called out on fabrication/plagiarism, well, people are going to know about it. Editors and proofreaders rarely get called out by name for mistakes. But that's irrelevant, since an editor/proofreader isn't really in the position to fabricate/plagiarize in a writer's piece...they're there to edit/fix/separate-the-chaff-from-the-wheat-and-keep-the-chaff