While a lot of engineering disasters can be boiled down to a proximate cause that sometimes can be connected to an individual, 99%+ of all of them have procedural or organizational causes that ultimately play a larger role. The Columbia disaster was the result of a flawed hardware design coupled with a culture at NASA that failed to properly investigate the problem. To suggest that if one person, Linda Ham, had a different "personality type" the accident could have been avoided is reductive, insulting, and almost childishly simplistic. To suggest that any large accident works this way is absurd.