You can't just divide the world into people who believe fallacies and people who don't. They are rooted in fundamental cognitive biases, everyone falls for the "just try harder"/"just be better"/"just don't put any bugs in the code"/"just have excellent test coverage" thing sometimes.
Certainly all the most experienced engineers I work with, who should definitely know better, still haven't fully internalised the fact that all code is broken.
Certainly all the most experienced engineers I work with, who should definitely know better, still haven't fully internalised the fact that all code is broken.