Linda rides like a monkey humping a football. She should wear a helmet when she jumps because she has no level of expertise to save her, all she has is dumb luck. But even if she doesn't wear a helmet she should not be telling people not to wear a helmet. I don't wear a helmet, and I don't think it's necessary to always wear a helmet, but I also don't think it's my business to tell anyone that there is not a reason to or that they should not.

Not wearing a helmet yourself is one thing, that is your choice. Telling people that they have no need to wear a helmet because only people that have badly behaved horses will get hurt riding is fucking moronic and deserves to be mocked, sneered at, and belittled.

If you're told about vampires, it's a good thing to be told about stakes at the same time.- Terry Pratchett