This is very common in our schools especially government owned institution. Teachers are nonchalant towards their jobs and students careless about their education. if every school has someone like Mr. Jack, it will surely boost the level of education in the nation.
You are right. The decay is enormous. The system is not designed to have many of Mr Jack type. However, outstanding teachers/administrator who knows the implication of their actions on the pupils will try their best to leave a memorable legacy.
Thank you very much.