/lit/ - Literature

Are there any other books like this? Everything about I am Legend is just genius, and it's always a pleasure to see science fiction that isn't just "yooo spaceships bro", not to mention the way Robert Neville seems to have two people in his head, sometimes fighting, but keeping each other in check

There have been three adaptations of I Am Legend (four if you count The Asylum's mockbuster), and all of them deliberately avoided the book's central theme: that Neville realizes and accepts that the vampires are the future of the human race, and that he has become nothing more than a relic of the past that must be destroyed for their peace of mind. Why have so many people tried to adapt this story if none of them want to face its message?