Here is an interview from back in 1985 with a KGB defector, talking about the ideological subversion of the US and how it would take fifteen to twenty years, minimum, to reverse the process.
Here is an excerpt:
So, basically, you in America are stuck with demoralization. And unless, even if you start right now, here this minute, educating a new generation of Americans, it will still take fifteen or twenty years to turn the tide of ideological perception of reality and normalcy and patriotism.
The result? The result you can see. Most of the people who graduated in the sixties, dropouts or half-baked intellectuals are now occupying the positions of power in the government, civil service, business, mass media, educational system. You are stuck with them. You cannot get rid of them. They are contaminated. They are programmed to think and react to certain stimuli in a certain pattern. You cannot change their mind even if you expose them to authentic information. Even if you prove that white is white and black is black.