the teachers are chayav misah!
the gemara says that when dovid’s only killed the male amalekim becuase his teacher taught him timcheh es zachar amalek – dovid hamelech said to the general’s teacher – arur oseh meleches hashem remiyah vearur moneah charboh midam, ika de’amri katlei (dovid hamelech killed the teacher) veika de’amri lo katlei