If I understand correct Trouillot is saying that the word "culture" is used as an excuse to hand wave deeper thought into the study of groups of peoples behavioral patterns. By saying that something a group does is just their culture halts deeper insight and discussion into why people may act or do what they do and thus we don't learn as much about people as we should and conversations about the nature of humanity come to a halt.
If I understand correct Trouillot is saying that the word "culture" is used as an excuse to hand wave deeper thought into the study of groups of peoples behavioral patterns. By saying that something a group does is just their culture halts deeper insight and discussion into why people may act or do what they do and thus we don't learn as much about people as we should and conversations about the nature of humanity come to a halt.