More dumb as a rock.
Their smart people devised the basic road map they are following back at the dawn of the twentieth century, and they haven't had anyone since with the capacity to revise the plan.
For example, he alliance with peaceful Islam was supposed to be sold to the population of the west through control of the schools and survive all challenges until Muslims helped stamp out religious people of all other faiths after which Islam would be held up as an example of how violent all religions are and backstabbing would break mankind free from religion once and for all. But the plan relied upon few outside the wealthy elite having actual contact with Muslim countries. In the years after the second world war the rise of cheap air travel and petroleum cash rich Muslim countries cause millions of working class people from around the globe to work in the Islamic world. The peaceful Islam lie was never embraced as intended, and it unravels more each day.
Many of the elements of their long term plan are like that. They manage to implement them partially, and then they begin to fall apart under the weight of a world population that is far more well traveled and interconnected than Marxists at the dawn of the twentieth century imagined was possible.
>>Their smart people devised the basic road map<<
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Joseph Stalin and the KGB devised their road map and playbook, and implemented much of it through Traitors like Harry Hopkins, Harry Dexter White, Alger Hiss and their STOOGE: Franklin Delano Roosevelt.
Presidents Truman and Eisenhower then insured the coverup, destroying the careers of great Americans like Senator Joe McCarthy.
Most of the worst of the ideas of the Left then came from Treasonous Scum or Useful Idiots in academia-—translated into cultural messages by outright traitors or just DIMWITS in Hollywood and media.