Being a race driver is more then being able to drive, they need to know how to setup a car, what can be improved and so on, not everyone can do that.
And you won't here me say that fighter pilots aren't trained, they are a pilot for a living and it comes with their job.
Also, there is a difference between a good racedriver and being the best, still living F1 driver.
Setup a car? When was the last time Schumacher put the engine in his car? Put the tires on his car? He knows when it runs loose, and when it is tight...when it's sluggish and when its not in the right gear ratios.....but the whole team does all of that. The same with a pilot, a pilot knows when his mixture is too lean or too thick, when the props aren't at the right angles, when the flaps need to be set, what the approach angle and approach speed are. That is much more to take into account tahn being a driver. after all, the driver DRIVES. the rest of his team do all the work on his car, and the same with the pilot.
And you won't hear me say that racecar drivers aren't trained, they are drivers for a living, it comes with their job.
More often than not though, you go to ground school, and take-off school and landing school and flight school.
When you are a racecar driver, you might go to some schools, but more often than not, your DAD teaches you.
Let's see your dad teach you how to drive...ohh, I bet he did. Let's see him teach you how to fly.