Again, it's based on logic and common sense. If one does not want a child logic and common sense tell us.....probably, more likely than not, the odds are...they will not look after it properly.
A child requires parents to "sacrifice" and in today's world that's a dirty word and to expect a young woman to sacrifice her dreams of higher education and a career and expect she will look after a child she does not want makes no sense at all. The woman will be bitter and the child will suffer. Also, young people change partners more frequently than in the past and a child results in a woman having to maintain contact with the father whom she does not want to maintain contact with.
Forfeited or postponed education and career. Continued presence of a person in her life she does not like. The reason? A child she never wanted. Logic and common sense tell us she will be bitter and the child will be the recipient of such discontent.
Would anyone who truly claims to have a child's best interest at heart insist a child be brought into such a situation? It's not logical and it defies common sense.