SSC's point is not "X is a near-universal scissor", it's that there's a scissor or ten for almost everyone, and that some scissors are likely to ensnare a lot of people.
If you've never found yourself arguing vehemently and extensively, to the death, about something and sometime later wondered what that was about, you may be a counterexample, someone who is scissor-immune.
I sure am not.
But I'm arguing (SSC may not be) that effective scissor statements create both passion and tunnel vision in people, even one at a time. And so when there are people with passion and tunnel vision on both sides, voilà, scissor. (It's a little bit like "drunken mob". You can't have a mob with just one person, but each person, arguably, gets drunk on their own.)
The story’s point requires identifying the psychological state state that scissor statements put you into, where you feel reality is actually bending against you (eg “he turned her against me”).
If you think there is an explicit scissor statement Alexander could have committed to, then I think you might not appreciate the core thesis.