i think fearful symmetry has something to do with a killer hunting his victim.  While trying to kill the hunter ponders many ideas; one is , is the prey going to kill me.  The poem by Blake is a bout a hunter.  Evidence i have is in the reading.  McAllister did say  "I've been a hunter most o'my life".  Tiger, Tiger is a spinoff calling a cat here kitty, kitty, or come out, come out wherever you are.  Childhood games often mimic serious adult situations.  Often these fantasies become repressed, and could create psychosexual lashing out.  Red John supposedly had psychosexual thoughts about people he intended to kill.  One person he reacted to this way was Jane.  In one episode, Red John is mocking or mimicing Jane - by drinking tea, wearing a suit, even sitting like Jane. Its the one where Harker Rosalind calls P. Jane;  The CBI rush over to her place, they find a dead coroner, but they dont find red john.  The police search the whole house for clues, but they find nothing.  Red John is meticulous, which brings him out of his psychosexual fantasy.  Killers often find routine to help them balance psychotic obsessions and socializing.  They ned something constant, because they don't have a constant good rapport with members of society.  Perhaps their best friend could be unaware of their behavior.  Since their behavior lacks any social signification  they seek some routine to create that missing support.  A killer may get friends to kill with him or her, so each other can reaffirm the psotive feelings they have remaining - about themselves.  Killers have real depths not just symbolic depths.  They desire to return to normalcy, which is now a great height.  In the poem by Blake, there is reference to distant depths and skies.  Blake is referring to these thoughts - which Blake is fantasizing about.  Blake focuses on animals by mentioning sheep - which an archetype reference to innocence or following ( lack of leadership) -also dependency on good (luck), because the ability to survive is not adapted to fighting for survival.  The killer/hunter is nearing a merger with the tiger (prey), and trying to succumb to the merging - and still hunt.  Jane is more like Blake's idea of the voice or protagonist in Tiger, Tiger by William Blake.  Simply, Blake was a sane human being with normal values, and Jane is that, a normal person.  Anybody would want to kill the guy who murdered his daughter & wife.  I have always associated that poem (for twenty years now) with a hunter.  Since Mcallister said he had been a hunter most of his life, I have to agree with Bruno Heller.  Red John is McAllister, and he is dead.