I agree, and this is IMHO why this is important.
Originally Posted by david b
If someone in authority is polite and informative, while they may be wrong, they believe they are right, and are most likely to respond positively to learning what is in fact right.
You probably cannot do the teaching right there, but there is a decent chance that subsequent contact with her supervisors may result in her doing the right thing the next time, and every time therafter.
I've worn a uniform, and been in a position of authority like this (customs officer) and last time I checked, I was human then (and thus capable of getting it wrong).