Dear White Xenophobes,
You clearly don't understand the human psyche. What happens when you threaten adults and tell them that they had better not do something? Why, even if they had no prior plans to do it, the idea of trying it suddenly becomes more intriguing to them, of course! By making migration across this imaginary border into something forbidden, you make it a challenge that some folks will become determined to conquer.
You like facts? Well, here's one: The US military is stuck in two god-forsaken wars that leave it too stretched out and distracted to put enough people on the border to actually prevent folks from crossing. Even Arpaio and Brewer's little stunts aren't enough to keep folks from crossing. All they have done is alienate people of color who are citizens, including those who might actually have gone along with a reasonable and comprehensive approach to migration.
My very conservative partner, who is just a swarthy man of German-descent and is often mistaken as a Latino or Arab, can no longer travel/vacation through AZ without worrying about being snatched away from his family. Do you really think he'll ever vote Republican again? You folks really didn't think this one through very well or maybe you just decided to let your prejudices win out over all other considerations. Either way, you played yourself, buddy. The cat's out of the bag and even conservative people of color are dumping your party like a hot rock. Thanks for playing, though!”