You're asking about hate… where does it come from. Is it "human nature" (instinctual). Put another way, is hate something that is NOT learned?
I would argue that hate *is* learned and, therefore, is not "human nature" in the sense of "instinct" (something we would all be born with regardless of any other variable).
If "hate" isn't "human nature" then where does it come from?
I believe it comes from "pain" and "fear" which, arguably, *is* instinctual. This gets a little complicated but basically we're born with reactions to certain stimuli. A loud noise, a sudden flash of light, physical pain, etc., can trigger a reactive (turn of the head, closing of the eyes, flight, retracting of the limbs, etc.) reflex in an infant. Such reflexes are hard wired, not learned. Every human being is hard wired to react to these stimuli the same.
There's also "rage." Don't know if any of you have seen an infant become 'apoplectic' or have a 'fit' of extreme anger. Usually this is brought on by extreme or prolonged discomfort, pain and/or frightening situations. Infants in such states are inconsolable and out of control.
So I mention these because reactions to pain, fear and, in extremes, rage *ARE* part of human nature. We're born with these reflexive reactions.
"Hate," however, is something that is learned because it associated with a specific 'object' (idea) that is hated. The learning associated with "hate" (perceiving something as a potential threat that must be shunned and/or reacted to violently) begins very early in life and may not be consciously or intentionally 'taught' by the parents or society around the developing child. But these attitudes are 'picked up' very easily by observing how others around one 'react' to certain things.
The amount of emotion behind "hate" -- where it goes beyond fear and/or dislike to a distaste that goes up the scale of reaction to full-blown violence and an attempt to destroy the perceived threat -- often comes not from direct experience, but from projecting repressed emotions onto the 'object' of hate. For example, someone may be violently homophobic but have had no experience with homosexuals at all. This extreme fear/rage, however, does come from early childhood experiences (we all have them). That is to say, we all have existed as infants in states of total vulnerability and have experienced being in a world that is 100% beyond our understanding and control. We have experienced the terror and pain of this existence and had no way of understanding these emotions. So, they are there, latent within us.
This latent emotional energy becomes 'focused' through learning onto a specific target that is 'hated'.
That's not to say there can't be real-world experiences that reinforce the 'reason' for the hatred. Of course there can be. But what I'm pointing out is, there need not be for it to occur.
So… Hate is not human nature.
Will it ever get any better?
This is where it gets very interesting because the answer to that question is, well, that's up to us. You and I. Everyone here.
Most of us here know that we can not change another person -- that the only person we *can* change is ourselves, and even that is far more difficult than one would think. But it *can* happen. We can change. I can not stop another person from 'hating' me. However, I can have at least SOME control over how I react to that 'hate'.
This, I think, is the only hope we (humanity) have.