I approve of the optimism that we can do better, with effort. However, that optimism cannot be blind if it is to be successful. The historical record demonstrates an overwhelming tendency for power to concentrate in the hands of individuals and small groups. Even with the best of intentions, people in positions of authority inevitably work to protect their authority, at everyone else's expense if necessary. They will convince themselves that they are right to do so, because no one else understands their work.

We only need to look at human history, and animals in general. The power of an individual is very limited, so those with shared interests group together for protection. The bigger and more powerful groups dominate the smaller and weaker ones and power naturally concentrates into the modern nation state, political party, corporation, etc. And whoever controls those groups holds the most power.

Your perspective requires that all humans be willing and able to come to mutually acceptable compromises for any disagreement. But that's obviously not possible, there are many disagreements where humans can't just split the difference or are simply unwilling to make any compromise for whatever reason. And so power becomes the deciding factor.