We may experience ourselves as individuals with free will struggling against impulses which we feel it would not be right to act upon, but the impulses come from the system and so do the ideas, factual information and beliefs, which cause us to exercise restraint. What is happening if we experience such an internal struggle is that tides which are larger than us are clashing in us. We are the location where this is happening, but we have no control over the process.
In the broad sense of the term the idea that there is such a thing as good and evil is a dualistic concept - that is one which divides phenomena into two opposing forces.
But the distinction between good and evil would only be useful if we had free will and could thus chose good behaviour and avoid evil behaviour. Since we don't have free will, we can't. All of our behaviour, whether constructive or destructive is a product of the wider system of which we are a part and over which we have no control.
From this systems view of humanity, it is precisely the idea that there is such a thing as good and evil which has acted like a virus to generate all of the behaviour we identify as evil.
And, since, all systems try to maintain equilibrium we can see that it is actually the fight against those forms of behaviour we identify as evil which generates that behaviour. If we try to push the system one way it will inevitably push back the other way. It is only acceptance which can bring harmony to the system.
This concept of the idea of good and evil as a virus contaminating the human system is, of course, expressed metaphorically in the story of Adam and Eve being cursed by eating from the tree of knowledge of Good and Evil. The only thing is that it wasn't knowledge but a delusional belief.