I think it's pretty simple to understand, it doesn't matter of what country the entertainment media is, if it reaches a considerable number of people, then it will be used for propaganda purposes. Actors are just most of the time, pretty faces with average intelligence (or dummies). But, people are attracted to beautiful people, so that's why they use them, to project their symbols as something cool. Some of them may know, but the majority just are told what to show and say, that's it.
Entertainment media is a weapon, and it's used to carefully introduce ideas, concepts or things into the brain.