Who are the people who believe in the kill threshold?

My cousin has been obsessed with牢A since December last year until February this year, sending me its screenshots every day.
At first, I didn't know what牢A was, so I looked into it. After seeing two screenshots, I couldn't stand it anymore—it's so absurd, completely lacking common sense.
So what kind of person is my cousin?
He lives in a third-tier provincial capital city, 43 years old, single, works as a warehouse clerk at a state-owned enterprise, a job that looks like retirement, with a very simple and boring environment.
His hobbies are PC gaming, reading various conspiracy theory posts, scrolling through Kuaishou, and recently he picked up a new hobby—playing with Doubao videos, face-swapping, putting his avatar onto the heads of so-called successful people.
When he talked to me about牢A, I almost rebutted him point by point, telling him how ridiculous it was.
He didn't believe me at first, but later he thought I had a point. Still, he liked to watch it, clearly telling me that he was just doing it for fun, even if there were a lot of lies involved.
There’s also an important reason he didn’t mention, but I could sense it—it's because a child of a mutual relative went to the US to study.
My cousin is somewhat insecure inside; he always feels that this relative looks down on him, but that’s not true—he just thinks so.
He keeps telling me that Sister XX must regret sending her son to the US, that the US is dangerous, and that her son might get shot dead someday...
Every summer, many American students die in car accidents.
Has Sister XX’s son gotten a driver’s license in the US?
Is he signing up for organ donation...
All sorts of dark wishes...
He also keeps sending牢A screenshots to the family group chat...
Just to let our sister see it.
At that time, I told him牢A would definitely be opened within two months, and sure enough, it was opened soon after.
I told him I read Green River twice before, but I didn’t graduate, with very low education, so it’s impossible for him to be an intern forensic doctor or anything like that.
The entire source of information is questionable.
This guy fell silent, realizing it was too absurd, and later shifted his focus to the Iran Lincoln explosion.
That’s my cousin, a former牢A believer.
Brother Feng was right—it's still about sexual repression.