I do wonder about this because hate had to come from somewhere. If hate is learned, who was teaching it originally and how did they come up with the lesson?
I personally think hate is natural, and that the whole saying "Love comes naturally, hate is learned" is actually a phrase that people learned and do not feel naturally. Human nature is light & dark. We gotta be careful not to think of ourselves as angels - we're beasts of the jungle really, top of the food chain, destroying our environment and killing eachother over resources and land, trodding on eachothers heads to get to the top of the rat race and then going home to switch off to it and enter our oblivious online entertainment world.