Most people look at having sex as their private right to do and therefore any "by product" as a result of having sex is also their right.
I agree too many people are having children without being "prepared" to take on the responsibility to raise them, educate them, and prepare them to be self-sufficient contributing adults to society.
Most people look at having children as an "automatic given". They never think in terms of it being something that is "optional" or consider the possibility that they just may not be cut out to be good parents.
A very long time ago when I was a teenager I thought driving a car was a "right" and my instructor explained it was a "privilege". In other words the state/government does not have to grant one a license to drive. They may also take that privilege away. Needless to say the state can't keep people from having sex or prevent them from conceiving children no matter how dire their financial circumstances are or lack of parental skills.
Clearly some people especially teens and young adults are having children to with the hidden agenda of keeping their mate attached or in a moment of insanity they thought it would be wonderful to make a "cute baby" between them. I've known some guys who acted as if they were doing women a favor by getting them pregnant. After a breakup one of them might say; "I really cared about that girl. I was thinking about letting her have my baby." LOL! It's a twisted way of saying they thought she was special. ha ha
In a free society people have the right to do things to make their lives difficult and miserable.