I just got to El Paso to cover the death of Jakelin Caal, and it’s currently 37 degrees. In Alta Verapaz, Guatemala, where she’s from, the average temp is about 77. It’s safe to assume neither she nor her father had ever conceived of this sort of cold.
And after a physically exhausting trip north, with likely little to no money, they weren’t going to have the supplies to deal with it. A humane immigration policy - even one with zero tolerance for migrants, legal or irregular - would understand this.
And be prepared to handle the myriad health problems migrants would suffer from. And given children and families have been coming en mass for a while, it would be prepared for adults, children, pregnant women, people with special needs, etc etc