What is the message of both quotes? How is the message changed in the edited copy?

Original: "If I may be permitted to borrow the Platonic metaphor, a large percentage of the human race is currently chained at the coalface in the darkness at the bottom of the mine. It would certainly be possible to free some of them from this position and promote them to foremen; but would the results be desirable? A few would have the natural ability to be foremen and would eventually excel in the position, just as a few of the existing foremen should really be chained to the coalface with pickaxes to fit their own natural abilities. However, even those would take time to adjust. It is difficult even for a well-informed, educated human being to make decisions concerning the course of the whole mine, in this case, or the whole people in a more general sense. Those who have been chained to the coalface in the darkness for their lives will inevitably, not through any fault of their own but because of the mind-narrowing circumstances of their lives, be only able to make decisions based on their own narrow sense of what is best for themselves. And though I said that some of them would be able to broaden their mind if given the opportunity—just as some of those currently with power are naturally too narrow-minded to take advantage of the knowledge and broader worldview they possess – too many would never adapt.

Thus we can see the fundamental flaw of a purely democratic system it is impossible for the people as a whole to make decisions for the good of that people  when a large percentage of them will always vote based on their own narrow self-interest rather than the bigger picture that requires a more open and knowledgeable worldview. Ultimately, everyone regardless of station will be better off under a different decision-making process, which I will now outline..."

Edited: "If I may be permitted to borrow the Platonic metaphor, a large percentage of the human race is currently chained at the coalface in the darkness at the bottom of the mine. It would certainly be possible to free some of them from this position and promote them to foremen; but would the results be desirable? A few would have the natural ability to be foremen and would eventually excel in the position, just as a few of the existing foremen should really be chained to the coalface with pickaxes to fit their own natural abilities. However, even those would take time to adjust. It is difficult even for a well-informed, educated human being to make decisions concerning the course of the whole mine, in this case, or the whole state in a more general sense. Those who have been chained to the coalface in the darkness for their lives will inevitably, not through any fault of their own but because of the mind-narrowing circumstances of their lives, be only able to make decisions based on their own narrow sense of what is best for themselves. And though I said that some of them would be able to broaden their mind if given the opportunity—just as some of those currently with power are naturally too narrow-minded to take advantage of the knowledge and broader worldview they possess – too many would never adapt.

Thus we can see the fundamental flaw of democratic systems: it is impossible for the people as a whole to make decisions for the good of the state when a large percentage of them will always vote based on their own narrow self-interest rather than the bigger picture that requires a more open and knowledgeable worldview. Ultimately, everyone regardless of station will be better off under a different decision-making process, which I will now outline..."