I think the mentality is shifting a little as millenials and gen z are slowly letting go of the meritocratic myth, but blaming internal motivations more than context is a problem in the American conception of the world we still suffer from as a nation. The inability of us to accept that our actions are not the only determining things in our lives seriously limit our ability to fully comprehend the world and how it really works which leads us to thinking ideas like work requirements are actually sane rather than completely counterproductive.
If you're just into shaming people for bad decisions, I'm not.
By sarcastically pretending that this 16-year-old made an affirmative choice to become a parent, the parent is actually trying to shame her for having sex as a teenager.
This goes directly to the heart of the article's point. Rather than confront a system that places some people at a disadvantage (lack of access to birth control or childcare), it's easier to insinuate that a person's hard life is solely the result of their own bad decisions.