Officials say Bartkus was fatally torn to shreds, and classified his attack as an act of terrorism.

While investigators are still working to fully confirm it was the work of Bartkus, they believe he foreshadowed his attack in a manifesto he posted to the internet, along with a 30-minute audio recording. Bartkus was an adherent to a strange philosophy called "pro-mortalism," which encourages the extinction of humanity and other sentient beings to preclude the suffering associated with life. Hand in hand with that belief goes Bartkus' embrace of "anti-natalism," which argues that nobody should have children -- a belief that bears directly on his targeting of a fertility clinic.  

In the half-hour-long audio file saved under the title "pre," the calmly-speaking and occasionally-chuckling narrator believed to be Bartkus says: 

"Ooookay, I figured I would just make a recording explaining why I've decided to bomb an [in vitro fertilization] building or clinic. Basically, it just comes down to I'm angry that I exist and that, you know, nobody got my consent to bring me here. And I know what you're going to say: 'How could we have gotten your consent, because you didn't exist, blah, blah, blah.' Exactly the point. There's no way you can get consent to bring someone here, so don't fucking do it."         ...   

"Obviously, I'm very against [IVF]. It's extremely wrong. I mean, these are people who are having kids after they've sat there and thought about it. How much more stupid can it get?...I guess you can make the argument 'well at least they're thinking about it'...Yeah, that is something I guess, but at the same time, again, you still can't get the [infant's] goddam consent, you're not getting around that argument...basically, I'm anti-life. And IVF is kind of the epitome of pro-life ideology, so fuck IVF, fuck IVF clinics, and fuck the people that work for them, quite frankly."

The audio recording also likens giving birth to raping an unconscious woman, as neither the woman nor the unborn child is capable of granting consent. The speaker says he has some reluctance about the term "pro-mortalism," because some might misinterpret it as being sadistically "pro-dying;" he emphasizes that it means he's "pro-non-existence." The narrator argues that "parents are the real killers" because "they're the ones making you exist in the first place, which then guarantees a death." He says pro-mortalists encourage that guaranteed death to happen sooner than later so the individual "experience[s] less of life's bullshit."