Slavery happens in nature. That is all. Galaxies collide, stars burn out, and emergent lifeforms profit from the forced labor of other emergent life forms - is that good or bad? No. It just is. Personally I find ant slavery, along with everything else about the universe, fascinating... but if I spend too long doing this, I get a sort of apathetic curiosity.
Not that I lose my morals. I just find it hard to see how things matter, when I'm a dot (human) on a dot (city) on a dot (Earth) orbiting a dot (Sun) within the arm of a dot (Milky Way), within our Local Cluster, filaments and sheets, vast, each strand holding a million worlds...
But that's just the feeling of "centrism" being lost, really. We thought that everything orbited around us, and now we see that we're rather tiny.
And it's not bad, either. I see how everything that I'm mad about, that I dislike, that I think is stupid, is just another dot. Except that the writers of those dots are the only other parts of the universe, AFAIK, that can look at these dots too. The "tiny blue dot" picture gives a sense of camaraderie; understanding the vastness of the world, even more so.