[smartkids]

Yes. This is why I defined "incompetence" quite carefully.

Finding bugs in Knuth's or NASA's code might be beyond "a reasonably skilled hacker". To find bugs in that code you would likely have to be "highly skilled", above average.

Everyone makes mistakes. Even professionals who are licensed. The idea is to minimise them to achieve a reasonable, expected level of "correctness". Competent does not mean "perfect". It means no stupid mistakes.

In my biased opinion, there's a high tolerance for stupid mistakes in software.