Zizara
kiwifarms.net
They're also prone to mental neurosis, which may or may not be related. (Birth defects too, Israeli abortion statistics can be wild)If memory serves, they're Ashkenazi Jews, who're inbred as fuck.
Really it's a mix of column A & B when it comes to this facet of nature vs nurture. You take someone who's already genetically predisposed to mental illness but instead of placing them in an appropriately firm but understanding environment where they could be managed into a functional human, their tendencies are instead exacerbated by being raised and learning how to socialise from another schizo. Rinse and repeat the process across a couple generations and you'd be surprised how quickly you reach Yaniv levels of instability in a person. To really go off the rails you need an environment where the boundaries are already skewed.
