Many, many thousands of children yearly, born from moral households and steadfast parents become wayward, steal, become prostitutes, through one mishap or another nurture. Many more thousands of the wicked grow up to be wicked because they couldn’t grow up any other way in such surroundings. But let one adopted child who has a bad ancestry go wrong and it is used as incontestable evidence for the inheritance of moral turpitude and criminal tendencies.
~John B. Watson, Behaviorism, 1930