The Horror, the horror

"The Horror, the horror."
In this phrase, Kurtz is talking about the uncivilized cannibals. The horror is how these cannibals are savages and have lost complete touch with their humanity. The horror is how easy and quick such a manifestation can take place. Their mannerism, moral, and ideals have gone down the drain and the ego is completely lost. The id has taken over rapidly and the horror is that these morals take so much time to instill and yet they can be destoryed in a matter of hours, days or weeks. Humanity, civilized behavior and social stability are virtues in a society but the cannibals have lost it all and Kurtz sees how easily humanity can be destroyed when survival and animal instict needs to take place. It displays to every individual that the id in each of us is that that far- and the horror Kurtz talks of is how scary it is that this id is not that far at all - it could come out at any second- and no one is safe.