Cloward-Piven Strategy from 1966 is a major reason. For the uninitiated, that would be described as “...the strategy of forcing political change leading to societal collapse through orchestrated crises...” . Sadly it appears to me that is exactly what we are witnessing, rather blatantly 60 years later, in the USA at this present time.
Antonio Gramsci predates them by more than half a century and his “war on position” delineates almost exactly what is currently taking place.
For the uninitiated: The Italian communist is credited with the blueprint that has served as the foundation for the Cultural Marxist movement in modern America.
The “the long march through the institutions,” to subvert Western culture from the inside in an attempt to compel it to redefine itself.