Eventually the science will show ADHD and a slew of other ND psychoclassifications are entirely genetic. It's very likely one of your parents are driving the same brain around as you, with all its faults and strengths. In their childhood psych didn't have the labels and treatments, you didn't really want to mess with those abusers. Society also found it ok to beat children that didn't behave. The parent with the ND brain was probably beat by their parent until they figured out how to wear the right mask. And not just beaten by their parents, but every single authority figure, teachers, pastors, etc. The cycle of physical abuse was only recently broken. We still haven't broken the cycle of emotional abuse this society forces on ND people. The majority of psych pseudoscience still ongoing considers ND to be subhuman, excluding us from studies, using derogatory language that only serves to dehumanize and not empathize, recognize, and accommodate. They fail to recognize the positive aspects that are unique and common amongst ND, so we end up not even realizing in ourselves. In your parent's generation they'd treat perfectly capable ND people with a lobotomy. There are probably more psych professionals practicing today that were taught by books written by the same folks who practiced lobotomies, than those that learned the still incorrect (but at least more correct than a fucking lobotomy fixes everything) science from 10 years ago.

Sorry for the rant.