This has always been the case, popular shows and movies always tend to reflect the culture at the time. During the 50's and 60's, the bad guy in every movie was

This has always been the case, popular shows and movies always tend to reflect the culture at the time. During the 50's and 60's, the bad guy in every movie was Russian. Vampire and plague movies became popular during the recession to ride the general feeling of unease and lack of control. Now with only a specific demographic watching TV nowadays, of course shows will reflect that group more than others.