The Qantas Engineering Procedures Manual Inspection Procedures require that any "Close up" (that's close as in shut) inspections must be carried out by the LAME certifying for the job. This means that any panels (or components being installed) that cant be seen behind that could have FOD in there must be inspected by the certifying LAME. The LAME takes full responsibility no matter who did the job.
And I agree there are much better ame's out there than some LAMEs. Especially Leo Wonker.
You havent taken in to account the extra pressure the LAME and the Flight Crew in the NT were in to get the aircraft away from the slot because of commercial pressures placed upon them from management. People react differently under pressure. When we are required to make decisions under pressure with conflicting information (from flight crew and fire fighters) we sometimes make mistakes that seem obvious in the cool light of morning.
Stapling an EEL feeder in cold blood doesn't compare.
Bogging up floorboards instead of Fibreglass lay ups is premeditated and negligent.