Because paternity leave is a very rare thing in the US. You may live in Europe where this being news sounds like nonsense, which more Americans need to realize. Less than 15% of US employers offer paternity leave,
And what percentage of the workforce is employed by that 15% of employers? For example, the US Gov't would count as ONE employer, yet they employ some 4 million workers...
and that is almost entirely exclusive to white collar professions.
There are very few 'blue collar' jobs in America, our manufacturing base having migrated to all those other countries with lower labor costs (not Sweden, Norway, England, France, Germany, etc.).
Paternity leave tends to be about two weeks here, as opposed to months in more progressive European countries.
You know, a worker could SAVE a portion of their income during the pregnancy to cover living expenses when they take advantage of the federal program know as the Family Leave Act - why must your employer provide healthcare, paternity leave, and retirement planning? Are US Citizens incapable of taking care of their own needs?
If you can't afford to put some money aside during your pregnancy, how are you going to be able to provide for the added expenses when the child is born?