It's wild that you don't necessarily need to even be abused to have childhood trauma. Like just having an excessively negative, spiteful, toxic and mean-spirited parent is enough, even if they never do it at you, or on purpose. Imagine being a doctor and explaining that to a parent.
"Hey you know how you don't have any friends because people find you unpleasant to be around? Well it turns out that your child is also a person, and finds you unpleasant to be around. Growing up in an environment where they are constantly subjected to your opinions technically counts as torture, since the situation was both continuously distressing and inescapable. You are literally so annoying that you gave your child brain damage."