From my experience and studies there is no difference between “good” and “evil”. I discovered this mainly through reading Richard Dawkins’ “Selfish Gene.”
If a mother wants the best of care for her children, she will provide them with as many resources for their survival as possible - an act clearly of good, from her perspective
But as she gathers these resources, she removes them from a system in which other organisms may need them. So her own selfish love has detracted from those others around her - an act of “evil” from the perspective of others
So an example such as this clearly shows that “evil” tends more to be a bi-product of excessive “good”, much like the evangelism of the Crusades and Inquisition. It’s obvious that the difference of “good” and “evil” is solely a matter of perspective, in the natural battle for resources.
Even more recently, I’ve studied the roots of two words closely aligned with “good” and “evil”: “angel” and “demon”. For this purpose we will use the Hebrew root for “angel”: mal’akh; and the Greek root for “demon”: daimon.
mal’akh - an immortal, spiritual being attendant upon God
daimon - an inferior divinity, such as a deified hero; an attendant spirit; a genius
From these definitions, a new interpretation for angel arises: a demon of God.
There is also another word in the hebrew version of the Bible, nephilim, that has been commonly interpreted as “giant”(Gen. don’t remember the ch. or vrs.; I’ll find it later and edit). It says that these “giants”, or “nephilim”, were the offspring of angels and the daughters of man. Many of these nephilim were “evil”, but some were good and became the heroes of lore. Now we refer back to the definition of daimon, specifically “a deified hero”, and we see that the demons of earth were actually the offspring of angels. Again, “good” begets “evil.”
By now it should be obvious of the thin line between “good” and “evil”. It seems to me that the motivating factors for “good” and “evil” are the resentment towards others for gobbling up all of their most prized resource: God’s love.
As my mother has told me many times, “The path to hell is paved with good intentions.”