They are programmed to be “normal”. So whenever something trends popular, they jump on board and it becomes more popular. Feedback effect.
Even illnesses and ailments. Perhaps ADHD… Perhaps chronic fatigue.
We accept fads, trends and fashions as simply being an aspect of society, but what if it is not natural.
Only real players can read this post, because NPCs are programmed to not consider they live in a simulation. So I am asking you – do you reckon you follow fads and fashions less that the average person? If so, we could be on to something!
Note: that doesn’t mean something popular doesn’t deserve to be so. NPCs don’t start anything new, ever. But they can amplify something that is trending.