I agree! It's absolutely possible that a clever person would disguise an intentional backdoor as an innocent mistake.
As the two can't be distinguished at first blush, the wise approach is to adopt an innocent-until-proven-guilty approach. Which is to say assume it's an accident until it can be proven intentional. This way, both possibilities are taken seriously without jumping from zero all the way to tinfoil at the drop of a hat.
As the two can't be distinguished at first blush, the wise approach is to adopt an innocent-until-proven-guilty approach. Which is to say assume it's an accident until it can be proven intentional. This way, both possibilities are taken seriously without jumping from zero all the way to tinfoil at the drop of a hat.