The pornographer owner of a Philadelphia “house of horrors” from which police recovered “snuff videos” depicting women being murdered published a rambling manifesto in which he ruthlessly mocked religious folks and fretted over global warming, a Post investigation reveals.

In his 2023 self-published book, “Worldview: A User’s Guide to the Human Brain,” suspected serial killer Raymond “RC” Horsch referred to humans as “an insignificant lifeform” no more impressive than dogs or cockroaches, lamented pollution and dedicated an entire chapter to ending racism — all while exploiting hundreds of drug-addicted street women for his own sexual gratification.

The Post acquired the 230-page manifesto before it was removed from booksellers. In it Horsch reveals himself to be a Nietzsche-loving atheist with a soft spot for social justice. 

“Every mention or reference to racial characteristics or race is, by definition and without exception, racist,” the deranged pervert claimed.

“The real solution is to not condemn and exclude but rather to embrace, value and celebrate difference,” he wrote, adding, “The key to the success of any society is diversity in all things — thought, intellect,social custom, race, ethnic heritage, gender.”

Elsewhere he reflects on human cruelty to the environment, writing: “The human species is analogous to a cancer,” and lamenting “the effects of resource rape, pollution and carbon emission.”

“The ice is not going to stop melting and sea level is not going to stop rising. Depleted ocean oxygen levels, mostly due to the massive dumping of waste and plastic, are causing irreversible extinctions and loss of entire ecosystems,” the twisted fetishist wrote.

The laughably self-described feminist and “caring predator,” who died last year at age 82, is now linked to the disappearance of at least seven women.

Horsch self-published at least three other works of smutty semi-autobiographical fiction in 2013 and 2014 which investigators are scouring for clues to his suspected crimes.

In “Empathy: The Memoir of an Empathic Serial Killer,” Horsch’s protagonist kills a desperate addict name Krista that he met in Philadelphia’s Kensington neighborhood — a blighted drug mecca the real Horsch was known to frequent, according to reports.

“I am a murderer,” he wrote. “I crush her trachea. I feel her hyoid crack and collapse. I kiss her tenderly on her lips and eyes. I cry and sob uncontrollably.”

He then describes in shocking detail disposing of the body in a bathtub using lye from a local plumbing supply store and an old plastic scoop, writing “Krista will live longer than most because she will always exist in my [photographs].”

The Post also discovered in “Empathy” Horsch’s protagonist hints he killed his own elderly mother by suffocating her with a hospital pillow.

Little information is known about Horsch’s real life mom, other than she helped raise him in nearby Bucks County, where he lived for a time with his wife before relocating to the Olney home.

For over 40 years, Horsch also used the stolen identity of a real-life Stanford University physicist, Dr. Stanley Stokowski — first in the 1980s to land a job at a chemical plant in New Zealand while on the run from US authorities, and later as a fake online fan account that posted fawning comments about the sicko himself, the Post discovered.

“It was strange. I was working at Livermore National Laboratory and I got a phone call in my office from a person who identified himself as a journalist for the New Zealand Herald. He said this person took my name, the police had already captured him. They thought he was a spy. But apparently they released him and he disappeared,” the real Stanley Stokowski, 83, said in an exclusive interview.

“I hate to have my name attached to his, but it’s a done deal,” said Stokowski when he learned from a Kiwi friend Horsch was back in the news for more disturbing reasons.

A massive investigation is underway into Philadelphia creep Horsch after police discovered over a million pieces of graphic digital evidence, chemical equipment, and weapons inside the Olney neighborhood home he owned.

The sprawling federal and local probe centers on the late pornographer and “artist” as well as his son Eugene, whose June 2026 arrest for a minor traffic violation triggered the house search after his female companion produced the ID of a missing woman.

Inside the Chew Avenue residence, authorities uncovered disturbing recordings documenting the severe abuse, asphyxiation, and alleged strangulation of missing women, including 2018 missing person Nicole Fusaro, and recovered urns containing ashes and containers of an unknown oily substance. No physical human remains have been positively identified so far.

In 2014, Horsch shocked the Philadelphia arts scene when he exhibited his photos at a gallery in Kensington, where one review at the time asked if it was “a catalog of victims?”

The show included, “images of a nude woman cutting herself, nude women bound, chained and bloody, a woman hanging from a cross and women crammed into cages.”

One photo series shows “15 years of photographs of female heroin addicts and prostitutes in Kensington,” depicting women “nude as they shoot up heroin,” according to a since-deleted 2014 Philadelphia City Paper article.

One video installation “ends with an image of a dead woman on an autopsy table, her organs visible, and then footage of her cremation,” the outlet reported.

“In my story, I quoted (from Horsch’s website) a ‘Stanley Stokowski,’ his alleged agent, and there is also a comment left on my City Paper post by an ‘sestokowski’ who claims that Horsch was a positive influence on their life — at this point it seems likely to me that all of this was Horsch talking about himself while posing as other people,” Mikala Jamison, former culture reporter for the now-defunct zine, told The Post in an email.

“That positive-influence comment is really the only thing that stuck in my mind.”

According to the outlet, in a 2006 interview with the UK’s Bizarre magazine, Horsch said, “my obsession is sex. Dark, fetid, extreme sex… do I get aroused by young women (some beautiful) shooting heroin? I surely do,” calling himself “an empathetic, caring sexual predator.”

On his now-defunct website Horsch likened his repulsive art to an exploration of the “pro-sex feminist movement” and called himself a critic of modern culture.

A bio on that site written under the fake Stokowski byline claims Horsch briefly worked in children’s television including the pioneering 1969 debut season of “Sesame Street” but a source at the company told The Post they have no record of his employment.

Stokowski said he’s baffled why Horsch picked him — or how he even knew his name. Stokowski came up through MIT and Stanford alongside Nobel Prize-winning physicists before moving into the private sector to work on materials sciences and semi-conductors. He published several papers on optics and laser technologies in the 1960s and is the same age as the late Horsch, he said. Horsch showed a keen interest in physics and sci-fi novels in his manifesto.

According to an Aug. 2 Philadelphia Inquirer investigation, Horsch got his shot at making pornography after befriending mob associate Salvatore La Russa at his Bag of Nails tavern in Philadelphia’s Center City. Horsch then produced a 1973 rape fantasy film about drug-addicted women titled “The Erotic Memoirs of a Male Chauvinist Pig” and a 2006 junkie horror porn flick called “Snuff!”

In 1984 Horsch was captured in New Zealand where he was living under the stolen Stokowski identity and working at a chemical plant. He was evading US law enforcement after jumping bail for a 1977 meth lab bust, following his 1974 arrest and conviction for making $180,000 in counterfeit $10 bills.

A 1985 psychological evaluation uncovered by the outlet called Horsch an “extremely bright man” who was “erratic but prolific” and wanted to live a rural life studying quantum physics where he could “deal with society as little as possible.” The shrink who evaluated him also called Horsch “grandiose, mistrustful, suspicious, and excessively controlling,” the paper reported.

According to law enforcement, the five named missing women with ties to Horsch are Gabrielle Amarando who went missing in 2012 at age 22; Maribel Fresses, 26, and Nicole Fusaro, 27, both missing since 2018; Blair Tonzelli, 35, missing since 2023 and Horsch’s ex-wife Amy McHale, 44, missing since 2016.