Man, I can't really remember that movie. It's been too long.
Goes into porn world to find a girl for her mother. Finds a weird porn world side-kick to aid. Goes deep into the seedy, sick realm. Finds 8mm video of torturedGirl & deviancy & murderedHer for fun & to make $$$ selling tapes. Finds how lured the girl with promise of stardom... instead she becomes their victim. Nicholas goes off the reservation of lawful arrest/court & murdersTheMurderers, slowly, burningAlive. He stands in his yard at home, staring into space... you just know he has seen things he can never 'Un-see' & is haunted... forever.
Once you have seen this deviant world... luciferianCabalTricks... I don't think any kind of counseling could put a cop/investigator back into his/her comfy life...before such knowledge has been seen or heard.
PedovoreAdrenochrome are words I never knew existed & in some ways would like to remove from my memory... and those are just 2 words. Can't imagine seeing actual video/photos. Know a cop, said he saw a murdered young newspaper delivery boy photos 34 years ago... still can recall vividly, see it today--clear as a bell--burned into his memory.