Valedictorian and there are many good explanations for "Demon" attacks.
4 thousand years ago, people had epilepsy, schizophrenia and other neurological diseases. Or sometimes, they simply heard voices from places they couldn't pinpoint, or it was science that was beyond their knowledge (I.E. Cosmology, Geology, Meterology.) People didn't know these things because of a lack of science and reason.
Today, we have these sciences, but groups like the Jehovah's Witnesses generally are ignorant of these sciences, due to the fact that many are poorly educated. JW's weren't encouraged to go to college until about a decade ago, not to mention most of them were homeschooled by parents that simply weren't smart enough to teach them.
And sometimes, completley intelligent people, wanting to belong to a group will ignore the reasonable and blame mysterious things on "Demons" rather than think there's a rather scientific, but rare occasion that happened.
Cases in point, when computers first got sound cards, the computer my grandmother bought played a wav file on startup. She thought the computer was "demonized" until I explained to her the science of digital sound.
I thought many things were demonized too, until I thought of scientific explanations. Like I used to go into fits of screaming and swearing. I personally thought I was demonized.
Later in my life, it turned out that I had a neurological disorder. There ain't no such things as deeminz.