So this is what the promise of amnesty looks like. “Death trains” rumbling through Mexico teeming with children, headed for the U.S. border. Teenage girls raped. Unspeakable violence at the hands of ruthless coyotes, carrying out President Obama’s stunningly reckless new foreign policy. Of course, Mr. Obama did not issue a formal edict inviting each of the tens of thousands of children pouring over the border from Mexico. He didn’t have to. His executive action legalizing underage illegals in the U.S. was all the invitation they needed. And come they did. At this hot pace, we will have more than...