It is important to have good education and reminders... however, I think someone's morals are not simple and something that will be influenced significantly just with classes every once in a while. It's something that develops (or gets corrupted) over time, due to a variety of factors (some intrinsic, others external). If someone completely lacks morals, I would think it's probably unlikely that they will change much overnight or via taking some classes they are probably not so receptive to in the first place.