My generation had Satanic Panic. Parents feared that satan worshipers were ritually abusing children. The stories fed upon themselves. Psychologists got in the business of "recovered memories", now-discredited. Parents saw evidence where there was none, until there were more than ten thousand police reports of ritual abuse. They weren't substantiated.
The Salem witch trials were not an anomaly. We create an enemy in times of peace. We gravitate to a cause.
AI existential risk is a really unusual candidate for this generation's Boogeyman. Unless you're a specific kind of nerdy techy person, the idea isn't emotionally resonant in the same way your children being abused in a Satanic ritual is for most people. Perhaps a better candidate would be transgender people? A lot of people are freaking out over the idea of trans people abusing their children in much the same way people did with Satanic cults.
Also, for all the arguments you've actually said, this post just as readily applies to global warming/climate change.
Climate change derives from Stefhan-Boltzmann's law together with the spectral dependence of the emissivity of various gasses. Stefhan-Boltzmann's law has fundamental theoretical and experimental support.
This is the basis upon which climate models rest. This basis is unquestioned.