What is the ruling on a teacher deducting points from all students due to the misbehavior of one of them?

No one is punished for the crime of another. The teacher's action of punishing all students because of one student's bad behavior is injustice and aggression. The teacher has the right to reduce only the behavior grades of the offending student, and it is not permissible for him to affect their grades in the academic subject. Justice is obligatory for the teacher in evaluating students, for the grade of the academic subject is not to be reduced due to bad behavior, because bad behavior has another punishment.