I'm not. I condemn slavery. Like holy shit, can you not assume that much?

The problem with slavery isn't that slavers don't benefit! How can you sit there and say that slavers don't benefit from the transaction? Why, then, would they do it?? Just to be dicks??

You're taking an ideological stance that you don't fully understand and not considering what you are actually saying. The fact that people benefit from it doesn't JUSTIFY it. Nothing can justify treating an intelligent creature as property. But that doesn't mean someone didn't make bank from it. That doesn't mean that people alive today are not still benefiting from the tragedies of the past.