We will assume that they are simply uneducated.
Here is a beautiful example of an open adoption blessing all members of the adoptive triad (child, birth parents, adoptive parents.)
Open adoption is this family's path
I am married to the most wonderful man on the planet (who is terribly good looking as a bonus!)
I am called Mama by a precocious and delightful six year old and a loving and sweet four year old little tank.