If one understands mass insanity, then one can understand liberalism, islam, mormonism, etc. They are all cults.
You say mass insanity, but the author does a good job identifying tribalism as a survival trait in the right environment. There are values in the cults you list that the West should share, though, of course, many it shouldn’t.
I have many Mormons around me and in many ways, they are a beautiful people. However, it is true that I would not even trust a Mormon to “aid an unbeliever against a believer”. This is how these minority cults survive in the West. Maintaining identity is a challenge, especially when physical characteristics do not help.
The problem, I believe, is individual insanity. These tribes promote leaders and many lead them to ruin. Members of tribes need to have a healthy distrust of their leadership. By the time the Kool Aid comes out, it’s too late.