en.wikipedia.org
IMO only—-
The family dynamics must have been extremely trying for BK’s family. For 27 long years, it seems they did all they could to help him through his OCD, his lack of friends, his autism if true, his heroin habit, his fluctuating weight, his failures at so much, such as flunking out as a wanna-be cop, etc.
Then he was 28, far away, they didn’t know he would kill, they just wanted him to fit in.
The above link and excerpt goes along with my opinion that the sister with the horror film is not really so unusual.
Maybe because this is NYC, but I know quite a few people who decided they were filmmakers. A low-budget horror film is easy. Your friends or family members are the actors, and they mostly just have to scream authentically even if they cannot act. IIRC, Spielberg also made a little film at home first, and these aspirational filmmakers think they’ll be the next big thing.
Of course most of the movies are crap and go nowhere, but here is my point:
I don’t consider the sister with the horror film to be weird. She’s grown up and has a profession. To our knowledge she has committed no crimes.
Did a horror film involving his sister affect BK’s desire to kill? None of us know, but IMO you’d have to be predisposed to violence anyway, because mostly these films are simply vanity projects of one’s youth.
I know many think his sister’s foray into horror films did impact him, but I don’t want her to take the blame for something that I believe never crossed her mind.
All just my opinion. Oh, also, one of my friend’s sons actually did act in a low-budget film that made it into a film festival, which encourages many people to think they’ll be stars.