Discipline is for everyone’s safety. It is not simply a power struggle. On the surface some things seem picky but, realistically, could be very dangerous. Tell the students why, for example, they need to be on time. I tell them, “I’m responsible for your safety. To you, I may appear overly strict, but you could be getting beat up in a stairwell somewhere, and no one would even know to look for you.” That usually disarms them and softens them a little bit.