To me, seeding ideas is internal to the people and society leading to chaos, as compared to external and physical forces like starvation, oppression and lack of infrastructure.
But while all that might have been a factor in the downfall of the USSR, I think other factors have been far more important.
Your arrow of causation is pointing in the wrong direction.
At the time, intellectuals in the US believed (and many still believe) that Communism(or whatever you call the economic system that was practiced in the USSR) is the superior economic system.
The USSR rotted from within due to fundamental economic problems like the principal agent problem[1] and the economic calculation problem[2].
The US didn't really have much to do with it, with the possible exception of "forcing" the USSR to spend a lot of resources it didn't have on weapons and space flight.
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1. https://en.wikipedia.org/wiki/Principal%E2%80%93agent_proble...
2. https://en.wikipedia.org/wiki/Economic_calculation_problem
In any other instance, if you described a certain adult as a person who, as they got older, continually hung out with 18-21 year olds, that fact would lend less credence to their viewpoints, not more.