So you will always find a person who is doing the enslaving but enslaving isn't human nature? I dont know how to follow that logic.

Let's take another class of slaves: domesticated animals. We've been doing that for a looooong time. We like them, but we don't consider them our equals and will in general readily murder them or sacrifice them to meet our needs. Most of what you eat has about the intelligence of a toddler. Cats and dogs we enslave as our emotional support are also intelligent creatures.

Since resources are always finite all creatures default to exploitation as a survival system. Humans are good at making up stories for why it's ok actually, but that doesn't mean it is.