Apparently this is to avoid disrupting the lucrative Mexican tourist trade and thereby angering the Mexican Government. Unfortunately I'm disappointed but not surprised given the acquiescent posture the US takes towards every Mexican outrage. Complete crap!
Here's a couple examples --- pretty girls missing in Mexico --- and how sad for their familes. They certainly don't look like the kind who would have knowingly associated with bad types --- and suddenly our government decides to take the side of the Mexican government which does nothing to stop the violence on the border?
http://www.laredosmissing.com/home.html