I sympathize with the efforts of the thousands of undocumented alien children flooding across our borders. I've seen much of this planet and most of it is a cesspool. I'm sure all of these children can tell you horror stories as to why they shouldn't be sent back to their country. I know none of them are going to say, "I've come here to visit DisneyWorld."
However, our infrastructure cannot absorb millions upon millions of people from all over the world just because where they live is not a nice place. This threatens our economy, our culture, our language, our laws, our borders and our overall standard of living.
I know this sounds heartless, but we cannot save the world.