I have nothing against adoptive parents but there is a reason why we want to raise our own kids. Biology matters. Your personality doesn't only come from your environment but it's in part genetic and it grows during adulthood. Yesterday I read a study that says up to 86% of your IQ is genetic. Knowing your biological parents will make you understand yourself better, your flaws and virtues.
There are some fascinating studies where they compare biological and adopted children who were raised together. Even after decades, the kids who were adopted were very similar to their biological parents in terms of personality. And the fact this is controversial because "it's current year, you guys!" it says a lot about the new anti-scientific wave.
