Seconded about the Besmenov interview.
Additionally, I would add the speech by JFK where he talks about "agents by night, rather than armies by day". The tin-foil hatters think that he's talking about secret societies etc, he isn't, he's talking about communism.
The subversion is real, and it has an effect. Flicking through my FB stuff it is easy to see how much of an effect it has had over the years- very comfortable grad types with good/ very good jobs and lifestyles are the worst.
One friend came out as a communist- he lives in Dubai and works for a multi-national. Anti-capitalist, pro authoritarian govt.
One business owner it the IT sector is now very hard left.
A sen. manager at my old IT employer, as above.
I could go on but it would just be more of the same.
How do people living these types of lifestyles become so deranged into despising the capitalism that has given them everything, including paying for education, healthcare, welfare etc?
It's because the Western democracies are open societies thus can be subverted. A closed society such as N. Korea, would be very hard to subvert.