US immigration policy is a mess and has been for a long time. We make legal immigration a lengthy, cumbersome process and reward those who jump in front of the line by arriving uninvited. Americans can easily see and readily sympathize with the plight of immigrants in our midst. They live here and become our neighbors. Equally desperate people, who opt to apply for legal admission and wait their turn in their home countries, remain out of sight and garner far less compassion. A Gallup survey finds 900 million adults worldwide want to leave the land of their birth. Of...