Well, a newspaper in Tennessee gets it -
Sanctuary cities are crying foul at Texas and Florida, but they have themselves to blame (yahoo.com). Seems that the writer nailed this one. Here's an interesting e4xcerpt from the linked article -
"Let’s not kid ourselves. Most immigrants aren’t flooding across the border to settle in Eagle Pass, Texas. They are rational humans who see sanctuary policies and know where they want to be. As it turns out, New York City invited undocumented immigrants with open arms until someone made it easy for them to actually show up."