Mera, I do understand your feelings! However, having worked in the computer field for many years, I can assure you that humans do make mistakes! I don't think that there is a single person on this earth that doesn't make mistakes, no matter how careful they may be. That said, most of us try to minimize them as much as we can. Aiming for perfection is ok as long as we don't let everything ride on that.
Hang fast, take a deep breath and remember that alcohol can only make things much worse!