Is my signature on a paper demanding the dismissal of a university professor considered an injustice to him if the university responds to the demand?

If a teacher is stubborn and causes harm to students, there is no harm in requesting his dismissal to prevent the damage, in accordance with the Hadith "No harm [is to be inflicted] nor is harm to be reciprocated." This is not considered an injustice to him, but rather a consequence of his stubbornness.