From the linked article:
The immigrants (a misnomer, they are correctly called illegal aliens) who had spouses or children who are U.S. citizens, knew long before they married or produced them that they themselves were subject to deportation for violating U.S. immigration laws. Yet they married those citizens, or produced children who were citizens, anyway.
What were those illegal aliens' plans for their citizen spouses or children, in the event they themselves were deported? And why did they put their own spouses or children at risk of having their families torn apart?
They knew they were exposing their children and spouses to this risk when they violated the law, and long before they married the spouse or produced the children. Yet they decided to do it anyway. What did they plan to happen to their families if they got deported?
And why is this a concern of the U.S. government, instead of a concern of the illegal alien who decided to violate clear, longstanding U.S. law, with penalties they knew in advance?