Stress
You receive the blame if the article names Houston as the capital of Texas. (Wait—it isn't?) For certain personalities, copy editing can be a highly stressful job. If you misspell a word in a book, it's out there until the next reprinting and everyone in the publishing biz will doubt your abilities. You have to sit at the kid's table during industry dinners.
You have to be on top of every word before the content (copy) goes to print. Because of the way the human brain works, it's easy to correct in our heads rather than on the screen in front of you. Sometimes, copy editors read work out loud or backwards to prevent missing words or other errors. The war never stops.
Mark Twain worked as a reporter before delving into fiction and essay writing. He once wrote, "In the first place God made idiots. This was for practice. Then he made proof-readers."
Sometimes, copy editors will work with a team of proofreaders, though this is not always the case. A copy editor may find that they're the only barrier between the writer's work and the reader. This type of stress can lead to a lot of caffeine. The caffeine can lead to a lot of energy. A lot of energy can lead to accidents. Accidents can lead to injuries. And injuries can lead to more stress. It's a vicious circle.