Is it permissible to expose a teacher who practices sodomy with students and to beat him with the help of relatives?

Sodomy is one of the most heinous crimes, and its perpetrator deserves to be killed. Whoever knows of this teacher's situation must advise him and explain to him the gravity of his sin. If he repents, that is well and good; otherwise, it is necessary to inform the authorities to take the necessary measures to deter him and remove him from the teaching profession so that he cannot carry out his malicious practices.