If you are saying that Plato and the Bible share the concept of “removing” someone who is harmful or even not directly benefiting society, I would have to disagree. Plato said that it is best to kill those who do not benefit society and the Bible does not say that at all. Psalm 82:3-4 says “Give justice to the weak and fatherless; maintain the right of the afflicted and the destitute. Rescue the weak and the needy; deliver them from the hand of the wicked.” We are called to help those who are less fortunate and care for those who cannot care for themselves, not kill them or cast them out. You referenced Matthew 5:30, which seems to agree with Plato’s assertions about the city. But this passage is talking about sinners, not those who are weak and needy, like what Plato was saying. I do not believe that Plato’s ideas concerning how to maintain a just city or soul coincide with the Bible, as you seem to suggest.