I feel for the workers directly involved as someone else said they are only human. Obviously nobody would deliberately do it so it's just an accident/incident that can happen in any industry & does all the time.
The real concern will be QF's handling of this event. I hope the guy/s get a fair hearing but with QF's now continuous media attention I'll bet that QF will do all they can in the publics eyes to show that an individual is/was responsible & not QF's poor track record of the way they treat their workers contractors as well.
Did a B737 conversion to freighter not have a hangar incident some time back? Sh1t happens, as long as no one was hurt it's back to the panel beaters
CW