In the singing birds song, is he saying, "another world" : perhaps a Garden of Eden? Or is he imagining this present world as Non-Dual? Hamlet --- the melancholy Dane --- recognized that Good & Evil are not features of the world itself, but a personal interpretation : “There is nothing either good or bad, but thinking makes it so”. Even so, Hamlet was driven mad by his pessimistic mindset. Can we be driven sane, by an optimistic attitude toward a world that can be interpreted either way? "It's an ill wind that blows nobody good". One person's misfortune is often another's good luck.
Back in my musically impressionable day, Bob Dylan concluded that the answer to unfairness and injustice and moral duality is "blowin in the wind". Does that mean there is no final solution to a world that blows both Hot and Cold, both Good and Evil?
My philosophical view is that the physical/material world is Monistic : a single dynamic causal force (amoral energy) that can have positive or negative effects, depending on the individual's me-centered --- or we-centered --- interpretation. That's why the Buddha preached a No-Self perspective, and the Stoics focused on self-control. Fairness & Justice are not of the world, but in the mind of the observer. The cosmos is what it is, but humans can imagine what it could be.
Apparently, homo sapiens is also the homo virtus of the animal world. Capable of seeing injustice, and of doing something about it, by working together toward the ideal of a fair & balanced society. By imposing moral structure on an amoral world.
Blowin' In The Wind
And how many years can some people exist
Before they're allowed to be free?
Yes, and how many times can a man turn his head
And pretend that he just doesn't see?
The answer, my friend, is blowin' in the wind
The answer is blowin' in the wind
___Bob Dylan