unfortunately, it appears that under the correct stress levels, most people are susceptible to evil, similar to going into shock at pain threshold, the soul can be literally pushed out of the body temporarily or permanently, another can jump in & take control.

same goes for extreme child abuse, starvation, specific technologies ect.. can trigger multiple personality, or attachments of spirits.. deceased human spirits, or from demonic fallen angel.

i know of a cure.. & feel strongly that it would work, not comfortable going into great detail like i used to years ago, something is different now.. we are at greater threat level in this war.

the tendencies & patterns of evil are almost robotic or primitive thinking, while some senses are enhanced, anything to do with an afterlife is forsaken for instant pleasure, therefore evil is dumb, can be mapped out & treated like a cancer virus.

many of the shape shifty stories in mythology & modern folklore are most likely the demonic spirits of tiamat naga, not actually a physical presence of body snatches.