44. Underestimate of the human factor
Somewhere between 50 and 80 percent of catastrophes occur because of errors by operators, pilots or other people exercising direct administration of the system30. Other catastrophic human errors happen during maintenance service, preflight preparation or design errors. Even a super-reliable system can be put into a critical condition by the right sequence of commands. We should never underestimate the power of human stupidity and error. If someone can break something by accident, he will. This applies even to the best trained military officers.