How does a safety-critical computerization project guard against the enemy within ?

By making the Collins Cl Submarine Development Project History required reading for all management personnel involved in any project involving the creation of software. It seems apparent from your previous questions that the text clearly portrays a "Whack job" in Human Resources, a "Nutcase" running the Safety-critical Software design team, and a Powerpath in charge of the whole project. Reading such a book would scare anybody into thinking that nothing can be accomplished if teamwork is required.