Very true! But again, rights and responsibility cut both ways. If one half of the partnership can kill the child or make the other half pay for 18 years of support, the other half needs some sort of recourse.
The best path is the old fashioned rules, which were made to avoid this very problem.
Trust me you don’t always know. Sometimes a woman who appeared for all the world to be in favor of having a child changes her mind when she’s pregnant and family gets involved. The threat of ostracism can be a powerful motivator for a 19 y/o girl. Love and reason can not always overcome fear and emotion.