some thought

As the book says, the mood of the group is simple and exaggerated. And groups are susceptible to innuendo, which breeds conspiracy theories, because you don't know if they're being incited or not. Because the truth mentioned earlier has been wiped out by the group's poor observation and analysis capabilities. If you don't get into a group, it's hard to know how they work, and once you do, there's no guarantee that you have an IQ...