I have not read the book with this title, but the title is enough, an apt summary of much of the West today, only we should say “tribes,” as most Western countries are collection of tribes now, not unified societies. And, predictions are, things will get worse, probably inevitably, once the state of decay gets to a critical threshold.
https://www.amazon.com.au/Tribe-That-Lost-Its-Head/dp/1842321609
https://www.realclearpolitics.com/articles/2020/06/27/think_the_cancel_mobs_cant_get_any_worse_think_again.html
“What America is going through right now is not merely another, more intense round of “cancel culture.” We’re now in the midst of a full-force, totalitarian remolding of our society, one that seeks to place the petty resentments of an outraged minority of leftist activists above everything else in American life. Because of their willingness to riot, loot, and assault anyone they perceive to be insufficiently sympathetic to their cause, leftists are able to bully ordinary people into submission. As a result, television shows such as “Cops” and “Live PD,” classic films such as “Gone With the Wind,” and iconic brands such as Aunt Jemima, Mrs. Buttersworth, and Uncle Ben’s rice are consigned to the “dustbin of history.” I used to speak frequently to nervous conservatives who were convinced that if we only allowed the left to tear down Confederate war memorials, they would be satisfied. How quickly events have disproved that wishful thinking. From Christopher Columbus, George Washington, Thomas Jefferson, and the western pioneers, activists are now coming after cartoon sports mascots and college fight songs. Everything -- from the core of our country’s history to the values and norms undergirding American culture -- must be uprooted to appease the mob. They are tearing down dozens of statues and facing no consequences whatsoever for vandalizing our public spaces -- including memorials to our nation’s greatest heroes. When private citizens try to do the job the government won’t and protect our culture, our history, and our public property from destruction, local officials step in and remove the statues on behalf of the vandals, lest they injure themselves while imitating Iraqis celebrating the fall of Saddam Hussein.