Africans didn’t sell “their own people” because Africa has never been a homogenous land. People who were handed over to European slave traders for profit were POW and indentured servants. Those folks were loaned labor that African believed would be returned after Europeans received the labor they were looking for.
Nobody could predict what would happen to Africans once they made it to the New World. Nobody could predict the vile conditions that they would be placed in as well as the generational oppression they and their offspring would face. Additionally African nations began to cut ties with European traders once those European nations started to become greedy and hostile. When the populations of african nations started to deplete and African royalty were being kidnapped and dragged into chattel slavery there was a problem.
African people literally fought against European colonialism once they found out what exactly European were up to. Unfortunately African leaders were executed for resisting European forces and their lands taken over by colonizers. This revisionary tale about chattel slavery propagated by white people and their apologist, telling the lie that Africans share equal blame for chattel slavery is a gross attempt to warp the narrative.
It’s the same as “the first slave owner in America was black”, a small grain of truth at the center of a fistful of white nonsense. Even with all that said no one made European create race based chattel slavery. No one put a gun to their head making them strip people of their humanity, create whole economies off of that dehumanization, and implement shady systems that would uphold white supremacy for generations to come.
Chattel Slavery =/= indentured slavery or religious slavery so people need to stop conflating. White slaves weren’t slaves because they were WHITE, Africa NEVER had race based slavery EVER. This is the reason why white people are not living with a legacy that still marginalizes based on their race till this day.