[mbivert]

Let me repeat myself a third and last time: I don't have enough data points to conclude; acquisition of enough data points to reach a honest opinion is to daunting of a task.

It's not because I don't share your viewpoint that I share its exact opposite either.

[optimalsolver]

What I think is happening here is that your image of a typical historical slave is a mildly treated house servant. >99.9% of slaves have either been toiling in brutal conditions involving large agricultural enterprises, mining, or construction projects (men) or forced into sex work (women). The latter is actually more evil.

Even in the case of the house servant you imagine the typical slave to be, you have not considered factors like having their children sold away from them, or the death of a kind master leading to being sold or inherited by a wicked one.

There are no happy slaves.