If you think about it, there are a great many people worldwide who have lived through years, even decades, of horrible treatment.
And often that horrible treatment led to maladaptive skills that led to more horrible treatment from people who know how to exploit weaknesses like that.
The following quote puts it very well. Be sure to read the whole piece linked below. Emphasis mine.
…For those who have experienced trauma, anxiety comes from an automatic physiological response to what has actually, already happened. The brain and body have already lived through “worst case scenario” situations, know what it feels like and are hell-bent on never going back there again. The fight/flight/ freeze response goes into overdrive. It’s like living with a fire alarm that goes off at random intervals 24 hours a day. It is extremely difficult for the rational brain to be convinced “that won’t happen,” because it already knows that it has happened, and it was horrific.
People who have experienced complex trauma can be difficult to deal with because they very legitimately do not fucking trust anyone.
The linked article laments that few therapists are trained in complex trauma, which is true.
I would add that very few people know that many societies in the world, including the USA, contain malicious groups that work complex trauma to super exploit and/or destroy people.
These groups either start with a person who has been abused or start the abuse themselves. It is a form of persecution.
It can be done by states to repress whole subgroups (“counter-revolutionaries,” for example). Or by clandestine groups to gain power.