That's my first reaction to the news. Critical infrastructure should have redundancy everywhere, including the support staff.
To give a stupid but obvious example what if Childs was run over by a car? OK, he wouldn't care but all the rest of SF would.
So they should never have put the network online until the information was in several places (the brains of several people if formal electronic/paper records were too inflexible).
Stll, this sounds like political infighting more than ever. Given the situation why were they trying to fire a critical person like Childs? Sounds like some bureaucrat with an ego as big as Childs would be involved to cause this, rather than Childs "going rogue". And he (the bureaucrat) was more skilled in the political game. Of course this person would be covering his tracks, and not be obvious in any way. So Childs and the whole of SF lost. His firing does not make sense otherwise, given his critical position.
Ah, the fun of weaving conspiracy theories