'Global slavery index' is not a credible source, even according to Wikipedia.
I'm sorry I spent 2 minutes of my life looking it up - I should've known better.
This conversation is over. I can't trust you to not throw random crap a google search produces that supports your fantasy that I then have to spend brain cells to debunk.
Then pick a different one. Which measure did you use to come to your conclusion?
I suspect you didn't use one at all, because I am not aware of any measure of "slavery" that correlates positively with any measure of investment activity.
Labor practices and protections are much better in countries with high economic investment.
Good talk.