It's the only way it's going to make any sense, I'm afraid.
edit: Here's a quick synopsis from what I remember of the movie compared to the book.
The first scene with the ape-men is supposed to represent how the monolith used its awesome technological powers to send humanity's ancestors down the path towards sentience.
Later, there's a scene where astronauts on the moon uncover a monolith, and it shoots out this piercing radio scream. This was actually meant to signal the larger monolith around (edit: in the book, it's Saturn) Jupiter that the subject race humankind had achieved space flight.
Later, space-capable humans would detect the larger monolith and investigate. Upon finding a sample of intelligent life, the monolith would take it and essentially jump start its evolution. The result would then be used to help further the ascendance of humanity, or something (I don't recall if Arthur C. Clark actually ever pinned down the precise goal beyond just advancing intelligent life).
The HAL conflict was based on the limitations of the computer's intelligence. HAL went insane, unable to internally justify lying to the ship's crew about their mission, while unable to tell them the truth due to his hardwired directives forbidding mention of the monolith at Jupiter.