May you never end up in a situation where you need understanding in that case.
I think if you are late by 10 to 15 minutes, You should have to apologize to the
whole class for being so. If one is any more late than that, Go home and come
back tomorrow. I am a hard ass about being late, but that's just me.
I have been there before. That is one of the reasons I dislike it so much.
But there discipline must be kept in order to maintain effective control of the class.
If anyone can just saunter in whenever they feel like it, then the scheduling and
therefor the rhythm of the class is broken. Being sent home a few times will send a
clear message to the student. Of course the are exceptions, however I have
found that the majority of the time it is just poor planning or an non serious
mindset of the student.