We can't expect junior people in our industry to interpret this letter in a way that does not effect safety. Just because a senior person ( COO or crusty old pilot) might naturally read this and infer that safety comes first, a junior cadet has yet to learn what safety is made up of and might not get the balance right. These cadets will be our Captains in the blink of an eye. Our senior CASA approved people need to be ensuring an environment where our safety critical people can learn their trade without threats, not sending messages like this. It's the Australian public who will pay the price for allowing cultures like this to exist in our Airlines. CASA is the watchdog who ultimately says " Carry on" or " Nah mate, not good enough for this country" .