More than 20 cases of teachers allegedly disseminating improper speech and inciting hatred in primary and secondary schools have been reported in the past month, concern group Help Our Next Generation said yesterday.
Its chairman, Or Chiu-fai, said most of the cases involved teachers from secondary schools teaching the Chinese language and liberal studies.
He said most of the complaints concerned the use of one-sided teaching materials or the advocacy of political ideologies.
"Teachers doing so may make students turn into sociopaths," Or said.
He cited three relatively severe cases, including a primary student who drew a picture of black-clad protesters burning a banner that reads "anti-fugitive bill."
There is also a Chinese flag and pro-establishment supporters on it with words that read "Kill them."
Or said he found the student hatred shown in the picture questionable, and suspected that somebody else at the school might have taught the pupil to draw pictures that involve hatred.
However, he refused to say if the picture was part of the student's homework.
Or said that there were social workers in that school who allegedly instill thoughts of hatred into students.
In a separate case, some liberal studies teachers at a secondary school allegedly used biased teaching materials encouraging the use of civil disobedience and other illegal means to change the status quo of the law, he said.
"These teachers even played a video named Legco is a Monster to its students," he added.
The video demonstrates the abnormalities of the Legislative Council in terms of its members.
Or said the group learned that the secondary school is highly concerned about the incident, but its reply on the incident is still pending.
He also said a Chinese-language teacher at another secondary school allegedly told students to have a debate on political issues, including whether students should sing political songs in school and whether students deserve punishments for voting on class boycotts.
Quoting a parent of the secondary school, Or said the teacher ended up playing videos that involve political ideologies instead of holding the debate on the grounds that to do so would be "inappropriate."
Separately, the group said a liberal studies teacher of Ho Lap Primary School who previously aroused controversy for using teaching materials that "distorted history" is no longer teaching at the school, but the group does not know if he has been fired or resigned.
In May, a video posted online shows the teacher of the school in Tsz Wan Shan as saying the Opium War, which broke out in 1839, was started by Britain to eliminate opium use rather than it being the case that Britain started the conflict after China banned the opium trade.