I never wear sunscreen, but I never get sunburned, either. I just keep moving, so the same sun rays don't hit me, in a single beam. You can't fry a June bug with a magnifying glass, unless you hold the magnifying glass steady, on one spot.
I don't believe any of what I just said, but other people do, if I keep a straight face while telling them, and if the want that to be true. People don't really care about the truth. They just want someone to tell them that what they want to believe is true. That's enough to get their vote.
If people want to fry their flesh in the sun, they'll do it, if someone tells them it isn't harmful, because they want to have a tan, but they don't want to know that it's not good for them.