In terms of his purported reason/motives, this is how one commentator views it:
"Brian Levin, the founder of the Center for the Study of Hate and Extremism and professor emeritus at Cal State San Bernardino, said that the author of the manifesto appeared to be part of a growing movement of alienated lone actors radicalized on obscure internet sites and misinformation....a hopeless, unstable young man whose suicidal despair [is] justified ... by an obscure anti-life ideology.”
Authorities are investigating what appear to be radical views that Guy Edward Bartkus expressed online in the months before Saturday’s attack.
www.latimes.com
IMO, whatever words all these suicidal attackers use aren't actually meaningful. They don't understand why they want so badly to kill themselves, but instead of going to get help from a therapist or
similar, they go down internet rabbit-holes - which just makes them worse.
IMO it doesn't matter which internet rabbithole they go down, they're all dead ends for a suicidal person...the best advice to someone like him would be to turn off the bloody internet, go outside, exercise, and call a hotline.
JMO