Why should I wear seat belts? I've been driving for years and I've never needed them. I even bumped into another car in a parking lot and I didn't need the seat belts. I hate the feeling of seat belts. They feel AWFUL and completely ruin the feeling of the car. Besides, my car has airbags...Probably not a troll. But this analogy pretty much perfectly parallels the argument against screen protectors, other than with the cost of being wrong, of course.
Honestly, I don't care if someone doesn't want to use a screen protector. But there are obviously people who read this forum who know nothing about their phone's screen and might actually believe people who say you don't need a screen protector. So that's why I counter those claims with the truth that many, many reasonably careful people have scratched their screens on accident.
Benny