Cultural Marxism comes from the Frankfurt School betting on Gramsci realization that Marxism will not work if tried to be implanted by an armed revolution but with a "long run" cultural subversion that can dominate culturally its institutions. Example: from destroying family and individual identity (specially sexuality) you prepare dudes that _will_ fallback to depend on what's left: the state. When that happens, gravitating to political clientelism is a piece of cake (everyone will defend The Matrix unless it starts to collapse like in Venezuela is).