One of the reasons for the collapse of the USSR was that the propaganda done by the US was better than the propaganda done by the Soviets. So it's not like there isn't a historical reason for this either.
A much bigger reason for the collapse was that the planned economy and distribution (plus military spending) failed to produce enough basic goods and quality of life for many started dropping.
To the extent that party elite started building their own, parallel universe of food, summer camps for kids, apartments, shops, etc. closed to the ordinary people. It was clear to many people that the Soviet road, as followed, goes to a variant of a North Korea lifestyle.
