We as a race was born and raised in a cruel world, where every fangs and teeth that hides in the darkness can rend our limbs, where resources can be extremely scarce easily and more untold horrors lurk in the darkness. Of course by our nature we were hardwired to be capable of heartless acts and tons of cruelty, or else we might be as good as a midnight snack to any predator.
We aren't too different from any other mammals. They can be capable of love, empathy, sadness, even cannibalism, and they can do that simply just because they feels like it. Just like humans! We are different because we got a bigger and juicier brain, and thumbs, not because we are capable of love. Heck, even my cat can cry when her kitten dies of cold
We are just animals that know how to make fancier toys :/
I guess I'm a pessimist