I always thought that the song was being sung by someone who had just died. A loved one has just learned of his death, probably by findingh the body (the flies gather around him AND the person he's singing to). He regrets his death (quite possibly by suicide), but now he's unable to change it. Now a spirit of some kind, he worries about the person he left behind being "alone down there" on Earth. For all his rage, he can't communicate with the person, despite being right there beside them.
I always thought that the song was being sung by someone who had just died. A loved one has just learned of his death, probably by findingh the body (the flies gather around him AND the person he's singing to). He regrets his death (quite possibly by suicide), but now he's unable to change it. Now a spirit of some kind, he worries about the person he left behind being "alone down there" on Earth. For all his rage, he can't communicate with the person, despite being right there beside them.
Just my two cents.