It's both hard an easy to explain, as it's also both good and bad the empathy to feel.
In an ideal society empathy would not be needed as humans won't ever hurt others feelings. What I'm trying to say it's that the only "use" I see for empathy is not to hurt the feelings of others. Why I think that in an ideal world empathy would be meaningless? because in the boundries of anarchy (an uotopia for manking, at least for the next 200-300 years or maybe more ) and my own way of being and intercating, empathy would be an obstacle between what we want to be and what we think might be bad being.
And I could go for hours, but hours of sleep are ahead of Me xD