@Mammillaria & @Velvetween the 'accident hump' is definitely a thing. All we can do is try to drum into our kids all the things that could happen.
But, I remember going out for a walk with my SiL and her, grown up, kids a few years ago.
The walk took us to a huge lake by the side of a hill.
Our oldest nephew said 'I remember diving into that lake in the summer from the side of the hill'.
I remember his mum just stopping and saying 'When did you do that? Don't you remember me and your dad telling you kids never to go into that lake as it has weeds in it that have pulled adults under?'
'Yeah, but it was fine mum. I knew how to avoid the weeds'.
'Avoid the weeds? What are you? Bloody Aquaman! ' (I always remember that one).
He's now 40 years old and his mum only found out about his summer of daring when he was 12 at that point...
All you can do is try.
My heart goes out to the families involved. Those poor kids.