I'm just saying it can be a crutch that you feel naked with out. ha ha. you see, I just made a funnyI did my fair share of bare knuckle training as a youth. That is one reason why I am in favor of preventing injnuries when possible.
But seriously, imagine one of your students getting hit, out on the street, in the groin for the first time ever, and then what may or may not follow. You would have to ask yourself if the constant wearing of the cup caused some bad habits to develop to the point where they weren't worried about it? Should we, at least, throw them out there on the training floor without a cup once in a while? Just to get a feel for the reality of there is a guy that is trying to kick you in the groin, and you aren't wearing a cup... Now Go!