Thorolfr:
Nevertheless, a man who was captured by the Romans in war and made into a slave who did back breaking work in the mines probably had just as miserable a life as any black slave in the south working in the cotton fields.
People back then often had miserable lives in general. Being a slave then probably had tradeoffs that being a slave in the 1800s didn’t. I’m not saying slavery is okay, but the reality is that slavery in Biblical times was largely an accepted way of life. As time goes by, humans learn and evolve and understand it is not a good thing, but learning takes time, sometimes generations.
To give another example, women were often treated as property of their father or husband or any man who laid claim to them then, and had few rights of their own. This too is in the Bible, but over time humans realized this was also not a good thing.
The Bible is in some senses a historical document. The life reflected in it is far from Jesus’ ideal.