It is simple. The African slavers wanted only women and children. They didn't want men. Until the time they learned they could sell them they just killed the men. I don't know how many would have been killed and neither do you. The fact remains they were killing all of the men. Those who were sold had a chance of living. Since you know there were lots of men slaves bought by the Americans you could see that the ones who made it through the voyage were alive were saved from certain death. I think the African slavers might have eaten a few, sacrificed a few before killing the left overs.
Seeing as, once again, two million people died on the Middle Passage, the argument that they were “saved” by being ensnared is comical.
Hundreds of thousands of Southern slavers fought and died to try and protect slavery. Your attempts to excuse that are pathetic.