Why the majority of poets are excluded from Plato's Republic ?

In fact the majority of poets are excluded from plato's republic because they misrepresent God , mislead generation and teach them bad morals.

and also human human are bad imitator, because they can't describe the pure reality and because of their limited thinking.

I hope to be good answer for all.

In his point of view,The content of tales is meant to instill virtue and a certain theology in the hearers. Instead of giving examples of appropriate tales, He attacks the great poets, Hesiod and Homer, for creating inappropriate tales. He says that these poets' tales include bad lies, which further unrealistic images of the gods and heroes . Gods must never be shown as unjust for fear that hearers will think it acceptable and honorable to do injustice. Tales cannot depict fighting among the gods.