I'm thinking of slashing at my students waiting in the hallway.
Do you see anything wrong with slashing at students?
Yes, but I think it is fairly reasonable for them to line up to my class everyday.
Exactly, they are doing what they were told. It is not okay to go on a rampage when they are just trying to get an education!
I have to hurt someone to make the crowd thin out so that I can do my job.
Smaller classes might be what you need then. There is no need to go on a violent ramapage when you can just suggest a smaller cap on the number of people in your class.