It would be interesting to know how those National Park figures were divided between the actual campground areas w/lots of people, and the remote campers. I would bet money that there are more issues within the high-population campgrounds. It's just not that difficult to attack a woman in a populated area, as most are easily intimidated and don't have any training/knowledge/thoughts on basic self-defense.
In all my years of camping, I've never had a problem. There were two times when the only other people nearby were groups of guys drinking, so I just moved on.
But there was one funny part of that article: "Shey uses her headlamp to keep her mind focused on the scene in front of her, attempting to switch off her imagination."
Unless you've got a dedicated stalker, the likelihood of a human troublemaker is remote, but not impossible. Somewhat more likely would be a carnivorous stalker of the bear or cat kind. One of the ways to avoid trouble is with awareness, and tunnel vision wouldn't seem to me the best idea available. And leave the headset home -- you might as well be wearing earplugs.
Maintain vigilance, but don't let fear control you because, mostly, it's a waste of time and energy.