It's bad to see benefits to slavery.
Charles is discussing slavery with a diverse group of friends, who are divided on the topic.
Charles wants to come across as open-minded.
Charles displays open-mindedness by listening to all his friends' opinions and ends up demonstrating how there were no objective benefits to slavery.
Charles listens to his friends and ends up saying that he can see how slavery had some benefits.
Charles' Black friend feels supported by Charles' clear analysis.
One of Charles' friends, who is Black, is shocked and saddened by Charles' opinion.