Plato, like Confucius (???), could not solve the problem of politics and resorted to trying to manufacture virtue in a factory, in order to justify totalitarianism. Western Civilization has suffered from him ever since. And if it were not for Aristotle correcting him, we might not have been able to recover from it.
https://www.quora.com/Plato-What-are-the-key-takeaways-from-The-Republic