I am only suggesting that they are not mandatory to learn how to operate a RC aircraft safely.
No argument there. I'm sure some percentage of 15 year olds could be handed a set of keys to a car with a 5-speed stick and make it safely from point A to point B without ever having driven before except at the NASCAR simulation at the arcade.
But certainly the transmission, fenders and surrounding drivers would be better off if some instruction was applied, and the learning curve would be flattened considerably. Some folks drive for years without realizing they aren't doing it right. I see that every day in my commute.