Because, like the young man who drove himself through a hedge, ditch, sleeping cow and 200m of field after overtaking me on a blind bend last week, they have absolutely zero understanding of risk.
It is often dismissed as being a killjoy but when kids learn their driving mindset on super mario kart etc, didn't have the same childhood of hard knocks we old gimmers had their idea of risk assessment, personal injury, pain factor etc is often lacking.
Cow was killed. Hedge an expensive thing to mend. Car a write off. Young man is extremely lucky to be alive with 2 broken bones and not an inch of him unbruised. He told his mum he had no idea pain could feel like that.
Bluntly, we need kids to hurt themselves when young. That's how we learn to risk assess. Being back those dangerous playground roundabouts, pedal cars, skipping ropes etc. Teach kids some self preservation skills.
I know... I'm out of touch, have no idea etc etc. But then again...