Listening to angry students is definitely a must.I have encountered students who are angry at the world, not at what just set them off. By listening you are more aware of what they are capable of doing. Also, when they want to vent, they come to you, not another student who might become uneasy speaking to him. Usually their vent has happened to you and you can make light of it and let them know how you handled it or let them know there are more important things to focus on.
