Simple is this: children are conceived. Some within marriages, some outside of marriages. No one is disputing that for children to be conceived within marriages is the preferable option.
However, when children are conceived outside of marriages, the natural fathers of those children have a right to raise their own children and thus to stop their adoption to random strangers.
Rather than having an abortion, she decides to have the child and have the child adopted by a loving family. She needs his consent but while he has no interest in the child or supporting the child, hes a control freak, he gets some sort of twisted satisfaction in keeping her dependent on him, as minimal as his involvement and support may be and as much as his "support" is merely court mandated, he enjoys making life as difficult as possible for her.
Dont think that this doesnt happen. Ive seen this happen. It happened to a member of my family.
Not saying the law is right or well written but just adding another POV.