Why would anyone advocate to not use a piece of safety equipment?
A bicycle helmet probably won’t do much if a car hits you- but it might. It can help a minor fall from being worse. All we can do is try to mitigate damage.
Think of it like disc brakes. They don’t completely eliminate problems but they give you a better chance.
If you don’t like wearing a helmet then don't wear one. But don’t try to talk someone else into not wearing one.