Oh, he's drowned. Never mind! Better luck with little Fred!"
Riding the bus alone for the first time: IIRC I was 11, but in a small village, I'd already ride a few miles from home on my push bike.
I wouldn't expect death as the most likely outcome of a public transit ride at this sort of age.
There's no one size fits all approach to raising children.
Oh, he's drowned. Never mind! Better luck with little Fred!"