The US imported all real psychos from Nazi Germany as part of operation Paperclip and let them loose on the local population to test their insane ideas about how to break and bend innocent people to whatever purpose using trauma.
Paperclip is also supposedly where the missing pieces for the nuclear bomb came from, which explains the sudden need to blow Japan into little pieces before the war was officially over.
These people are clearly insane, and will eventually have their power taken away and be tried for their crimes; or burned at stakes and torn into pieces by angry mobs, depending on how much forgiveness we're capable of collectively.