You’d need a good investigation into the nature/nurture situation of adopted children. I grew up in an abusive adopted home and only discovered my biological family in my 30s; they were not abusive to the kids they had later in life. It’s been an interesting journey because I rejected my adoptive parents, their morality, their religion, their politics, and their worldview decades ago, but when I met my biological family it was like walking into the home I’d never known I was missing out on. We have uncanny similarities, senses of humor, social/political views, and atheism. Outwardly, you’d look at me and my family and think “became a product of the environment they were raised in”, except I got there without any of the nurture of their home.