Gives all the countries participating in sending people north the chance to remove their undesirables from their countries and send them here.
Large numbers of teens and pre-teens arriving is not the same as the Mariel boatlift when prisons and mental hospitals were emptied. Reminds me of the story my husband told me in the late 1960s when he came back from Brazil. He said prior to a major event, perhaps a hundred street urchins were rounded up, put on a boat, taken out to sea and pushed overboard.
Given the state of mental hospitals in Central America, the severely damaged state of their occupants would make it impossible for them to survive the 1,000 trip with Coyotes to the US border. I have traveled by land as far as Nicaragua and visited a Mexican mental hospital. In fact, I would suspect that the kids surviving such an ordeal and having the will to make the trip probably are superior to the ones who stay home.