Why were serial killers so active in America during the 2nd half of the 20th century?

Question

Edmund Kemper, Jeffrey Dahmer, John Wayne Gacy, David Berkowitz, Herbert Mullin are some examples.

In: 3

Answer 1

It’s not necessarily that they were more active, but there’s was more awareness and investigations. I am sure they are still out there but being more careful not to get caught and are aware of the current investigative techniques. Human nature doesn’t change.