I think it's more like you're the commanding officer of a silo who gets replaced, locks everything down and refuses to let your successor into the silo. Your successor would like to come in, perform maintenance, and prevent the thing from degrading and exploding, and you refuse to let them in.
As for competence ... well, Childs gave different passwords to these same managers the week before when he wasn't getting fired, so he clearly didn't have THAT many reservations about handing them over. The juror actually referred to that quite specifically if you read the article, saying that was what convinced him that Childs was not really worried about password security but about causing problems (my words there, not the jurors.)
And honestly ... if I worked for you, and locked you out of your own network, locked down all the machines and walked out saying you weren't competent enough to have the passwords ... would you really defend me and be pleased no one could access your network hardware? If you hired a replacement for me that you liked, and I refused to give HIM the passwords saying he wasn't competent either, how happy would you be that I was protecting you by preventing you from accessing your own hardware? And when I started withdrawing money and getting ready to flee to Mexico ... you'd still be defending me?