Immigrants are surging across the border, as even they admit. If admitted, those children are going to need to go to school, those emergency rooms are going to have more people with previous poor care to deal with (and the C19 infection rate is apparently high), the local police and sheriff's offices are going to need to deal with this and the states and counties are going to have to pay for this.
But what does the Washington Post focus on? The political fallout for people in Washington, especially Biden and Congress. I have stated many times that the events around the world, and even in their own country, are not real to them. All that is real is the power movement in DC. Everything else is counters on their board. Wars, people dying, genocides, oppression, famine - none of these are real.
I mentioned recently the sad but frightening separation from reality that young people and those who also live in online culture are experiencing. I had forgotten that we have seen this before in different form: the lure of the Imperial City and its claim to be the only reality. I'm not big on forcing any American to do anything. But perhaps our federal politicians and permanent civil servants down to some level should be forced to hike the Appalachian trail with no more than two other people, or sail on the ocean for a month with only emergency contact so that they are alone in their own head except for a book or three*, or work in a foreign orphanage or clinic with no cameras or reporters allowed, or live on a family farm or help run a small business (in disguise) for a few months - every couple of years. We no longer have Cincinnatus, twice dictator for a year in crisis, who returned to his family farm when the crisis was past. When George McGovern retired from the Senate he tried to start a business. Within a couple of years he was saying he wished he'd known what it was like while he was in the Senate. An honest man, and those are in short supply these days.
They simply don't think we are real. Children on the border are only pictures that can be leveraged by one group or another.
*All books older than 50 years, and at lest one older than 100 years.