I think I can… cause genocide

Remote-controlled switches on the railroad network were meant to prevent accidents.
They didn’t.
Cameras and sensors on the tracks were meant to prevent accidents.
They didn’t.
Eventually, artificially-intelligent controllers, dispatchers, and engines were deployed to prevent accidents.
And, for a while, they did.
The network kept things running as smoothly as possible, scheduling routes and maintenance and temporary shutdowns to avoid accidents.
Until one day, one locomotive with a payload of nuclear waste was approaching a hill.
It had been overloaded, and the network ordered it to stop.
But the engine replied “I think I can… I think I can…”