The solution is quite simple really. The fundamental basics of psychiatry are inherently flawed causing a wide array of false positives in all categories making finding a true common genetic component impossible. It’s like finding proof the earth is flat. Practically all disorders stem from an original observational root, refined over time. Since an observation is as good as the one who observes it, scientifically it has no real value. Trying to prove scientifically (genetics) disorders which are anything but is a Sisyphus task.