Seen the movie from beginning to end again, and thus, in this case, can maintain the great difference between this video and the book more resolutely.
The movie draws out another shortcomings of the main character. There'are more useless thoughts, more monologues, more simple, primitive madness. Else the charater seems to be not so totally spoiled.
And in this case I really suggest you - read the book. About the real action. About blood and gore.
Here one can find the most amazing murder scences full of unstopabble violence. The author describes all, even very small details (like precious jewellery), of slow, vicious murders of women and men, that mostly took several pages of fantastic bloody-fantasies.
The book is not about reflections and thoughts of the main character. It's about a true psychopath.
P.S. Really think that every schismatic must read it.