Which literary theory does Plato's opinion apply to? Why do you think some critics agree with Plato when it comes to children's literature?

The literary theory that Plato's opinion apply to is moral criticism due to the fact that he believed that art was a weak reflection of the real world, which the real world in turn tries to imitate. Critics agree with Plato when it comes to children's literature because it will set a good example to the children whose minds are still vulnerable.