More damage? The splitter is in plain talk made of thin crappy plastic, what damage could a protector do to it? discolor it, maybe cause some rubbing with it on ? At the end of the day, if the protector damages the splitter, then you are back to replacing it. With or without it, it will have to replaced in the future (if the protector does damage it and assuming you care).
Anyone here with a hellcat/Demo/RE that has some miles on it that does not have road rash on the splitter? If some here can drive the car for thousands of miles and not have a chewed up splitter, then I agree there is no need. My experience greatly differs, then again, I don't baby my cars.