As described in Saving Gaia, we should be looking at the planet in terms of Rational Darwinism. Darwinism is obsolete – there are no origins of new species except in the deep Amazon or perhaps wild Siberia. Rather Gaia theory should rule of the day and be our guidepost to judge current events and problems. With this in mind overpopulation of the planet is our most serious and threatening concern and the wanton, irresponsible, fecund reproduction of the Central American countries shouldn't be laid on our doorstep.
Capturing these pathetic people and putting them in overcrowded cages obviously is not the answer. We have to get to the etiology of the sickness: the poverty, religious superstition, ignorance, apathy, drugs and above all the callousness of the ruling juntas. I'd start with undermining and eradicating the power and influence of the Church with its “be fruitful and multiply" mentality. In the meantime spending six billion on the wall is merely a band-aide on a serious hemorrhaging. Much better spent would be making their domestic lives more stable and providing stability gained by education.