St Alled has it right.
Serious stuff but it needs to be said.
The crew in the Cork accident broke the rules big time, but why?.
Maybe because of the pressure they were put under to get the job done.
This kind of pressure will lead to accidents and incidents, like the one we saw in Cork, like the time an aircraft blew over in the wind whilst taxiing out at IOM, like the one where an aircraft flew all the way from BHD to IOM with the baggage door completely open, like the one where an aircraft taxied out and took off with it's wing completely covered in thick frost (despite being advised by ATC), like the one where an aircraft made an approach in a very low cloud base, made a dirty dive and burst all of it's tyres on touchdown at the IOM. These are all reported and recorded incidents. There are more.
Unfortunately, I doubt very much that the crews who are put under such pressures by the ticket seller will speak out and tell the whole story, this through fear of retribution and loss of employment.
Unless they do, however, the effectiveness of the investigation will be diminished and nothing will change. The next accident will be just around the corner.