If I had a penny for every time I heard that devs are not idiots, I'd be billionaire.

It's true, but devs are not infallible and that's the point of Rust. Not idiots, not infallible either.

IMO admitting that one can make mistakes even if they don't think they have is a sign of an experienced and trustworthy developer.

It's not that Rust compiler engineers think that devs are idiots, in fact you CAN have footguns in Rust, but one should never use a footgun easily, because that's how you get security vulnerabilities.