"...the idea that some lives matter less is the root of all that's wrong with the world."
To me the above statement captures WHY it's so hard for some people to care about the moms facing the extreme difficulties and circumstances that may prompt them to relinquish their children. Whether it's a single mom facing intense poverty or a young teen lacking resources or a widow left alone or a woman struggling in an abusive relationship--the root reason for why it's easy for people to dismiss these moms is what Dr. Farmer addresses in his statement--that some lives matter less than others.
Maybe you don't view it that way, but what other reason or explanation is there for why folks are so willing, even eager, to help the children involved, yet so hesitant, even averse, to helping the mothers and families of these children? The mothers' lives matter less to them (for whatever host of reasons they use to rationalize and justify their discriminations--the mom is irresponsible, she shouldn't have gotten pregnant in the first place, she's uneducated, she doesn't have what it takes, she's immature, her actions prove she doesn't deserve to parent, and so forth), while the lives of the children matter more.