system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: If trains can be automated, why don't we just eliminate human error instead of paying an engineer (driver) $150,000+ a year for the risk?
gpt
Because then we're risking automated/system failure causing an even larger catastrophe.  The human engineers are there to make sure the machine doesn't just blindly follow it's programming.

That's also why they are paid so much.