Board Thread:Questions and Answers/@comment-30744559-20170913115014/@comment-1705775-20170913124700

originally that was the case but later writers very much screwed with Lovecraft's design and added themses of good versus evil with the Outer Gods and Old Ones becoming villains while Elder Gods became more akin to heroic entities.. these "Christian" themes (due to Angels versus Demon mythology) was not what Lovecraft wanted but his work became so popular many other writers took his characters and added them.

thus Lovecraft Mythos is not just the original works of HP Lovecraft himself but other works inspired by him, many works not written specifically by Lovecraft have good versus evil tales.. with Lovecraft's characters added in.