It’s always been bad to us living today, but it hasn’t always been bad to people in the past. I’m not a moral realist because I don’t see what sort of objective facts are moral. The universe doesn’t care. It’s humans who are moral, and what’s considered good or bad varies quite a lot. No, I wouldn’t want to be enslaved, and the golden rule seems like a good principle to live by, but nothing in nature makes it true. It’s a value judgement we moderns make.