When a train goes through a tunnel and it gets dark, you don't throw away the ticket and jump off. You sit still and trust the engineer.
Failure is central to engineering. Every single calculation that an engineer makes is a failure calculation. Successful engineering is all about understanding how things break or fail.
Nobody just leaves medical school, especially given it's fiercely competitive to get in. But I had a sister who was a doctor, another who was a pharmacist, a brother who was an engineer. So my parents already had sensible children who would be able to make an actual living, and I think they felt comfortable sacrificing their one strange child.
My dad is an engineer and works on green energy, so I'm very aware of what it takes to keep a modern home running and how we can simplify.