The vast majority of women who find out terminate. It is not a "significant" minority. It is a tiny number who chose to keep the baby. Children who are outside the norm are not seen as desirable. This guy and those who terminate both think that
It isn't simply 'desirability'
The massive impact on the lives of the whole family are a huge factor in any decision to terminate.
This man just thinks they shouldn't be born, despite it having no effect on him personally.
The mindset of this man and women facing that decision are not the same. At all.