A while back Stephen King wrote a "Danse Macabre" which, among other things, discussed how the popular trends in science fiction, and especially horror films reflect the fears of the generation of young adults growing up in that era. For example, "Invasion of the Body Snatchers" reflected the Red scare of the era in which it was made. In other films of the same era monsters were created, or unleashed, by nuclear tests. Many of these latter films were made in a Japan still scarred by the memory of Hiroshima and Nagasaki.
Today as an America with the life sucked out of it by banking Ponzi schemes shambles mindlessly across the globe leaving death and destruction in its wake, Zombie movies are really popular...and vampires seem to be all over TV.
Just a coincidence I am sure.
Be seeing you.