Bull. 7 out of 10 women are raped who are on the path of coming from Mexico, illegally immigrating. Children are routinely bought sold and raped by their traffickers and other migrants. Why are they just starting to care about one child now? They certainly didn’t care about the children when they were forced to walk until their feet were blistered and bleeding, or when they were hot, sick, hungry, removed from their home and taken to an unknown.
The last things that we need in this country are a group of people who treat children the way that they do with absolutely no concern about them.
The Liberal, Globalist, Socialist, Invader narrative is "We just want to give our children a better life!"
The truth is as you stated. Moreover, our porous border not only allows drugs, crime, and disease to flood into our nation, but Human Trafficking (including the sex trafficking of children) is epidemic across the states of Arizona, Texas, and California.
You won't hear that on CNN.

CNN won't tell you about the sex trafficking of children across the border. The only care about "reuniting children" with their "parents" (who in many cases are not even their parents).
“Why are they just starting to care about one child now?”
Probably because it’s BACKFIRING on the organizers who thought they would hurt Republicans by having photos of women and children being ‘abused’ by the US at the border.
Instead Trump is taking advantage of this stunt to show that Republicans want SECURE BORDERS, while the Democrats are not even able to tell them to turn back (or at least stay in Mexico).