Slavery has a profound and complex history. The way their were treated was brutal since time immemorial. Their main purpose was to protect their masters from anything and everything at every cost even the cost of their lives, because obviously their masters’ lives are more important than theirs (sarcasm intended).
Slaves back in Egyptian days were treated no different. They use to smear themselves with honey whenever they spotted any bees around their master in order for the bees to move away from the Pharaohs. That’s some painful and brutal service right there.