How Have People Become This Unhinged?

Originally, the word "anti-natalist" was used instead of "pro-mortalist", and I had never heard either of these words in my life.  How do these dangerous people get indoctrinated with such ideas in the first place? 

We should feel thankful that this terrorist didn't end up bombing a hospital maternity ward or nursery!

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Palm Springs IVF clinic bomber ID’d as Guy Edward Bartkus, a ‘pro-mortalist’ who opposed people being born ‘without their consent’ 

"A 25-year-old self-described “pro-mortalist” has been identified as the attacker who detonated a car bomb outside a fertility clinic in Palm Springs Saturday — killing himself and injuring four other people, according to sources.

"Guy Edward Bartkus, of Twentynine Palms, is believed to have detonated an explosive device in his car outside the American Reproductive Centers, which performs IVF treatments, egg collections and other procedures, law enforcement sources told The Post.

"Bartkus allegedly described his fanatical pro-death beliefs in written and recorded manifestos as being against bringing people into the world without their consent to spare them from future suffering, KCAL news reported. 

"On Saturday, FBI agents swarmed his home and evacuated the neighborhood, declaring it a “blast zone” over concerns that he could have left explosives behind, ABC7 reported."