It's terrifying reading and learning how this country spawned so many serial killers/rapists throughout the 20th Century (1900-1999).
I wonder why America has had so many during that time span

that's something to be studied upon...
Some say serial killers still exist, although I don't buy into that
if a person kills a specific amount of people they're automatically deemed a serial killer notion people try to spin these days.
There's a complete difference in the type of killers we have in society today compared to the kind who existed during that period.