That's what job interviews are supposed to be for. It should be easy to hire only the most skilled programmers, especially with the massive number of unemployed programmers out there right now.
Don't bet the company on no one ever making a mistake. Set up a system where the unintentional risks are minimized and the consequences of inevitable failures are mitigated by seatbelts and insurance policies.
Joking about Rust users rhymes with joking about vegans; it’s true both parties generally can’t keep from talking about their choice. But you do want to hire someone who’s thought about their options and made a decision.