Mike Wazowski gest banned from the Monsers University because he gets to the human world without approval and uses scare tactics on adults.
But watching the scene, I realized how much scream he could actually generate. And later on he is asked how the heck he was able to do it.
But still, he gets banned from the school. I cannot understand why. If he stayed, the monsters could produce much more scream than just by scaring children.
Is there any (in-universe or out-of-universe) explanation for this?