What is the significance of the report Kurtz has written for the International Society for the Suppression of Savage Customs?

The significance does not rely on the report itself, rather the way Kurtz concludes it. As a formal report, it contains numerous observations but lacks ideas and solutions. None-the-less, Kurtz completely contradicts the report in his own final postscript, written in his own hand, where we learn his true feelings about suppression. His words read, “Exterminate all the brutes!”