All I know is that my daughter was told in training that if they ever make that mistake, walk off the plane, hand in your airside pass and go home to wait for your P45!!!
Whilst I understand that they wish to convey the importance of adhering to saftey/standard operating procedures, to be honest, imho, that approach of threatening instant dismissal does not benefit anyone, and actually reduces safety procedures.
What it does is result in people not reporting safety issues and procedures that could result in benefits for everyone and puts the fear of God into new recruits so much that they may be frightened and actually make mistakes