Oh don't get me wrong, I completely agree with your point but I guess I am trying to rationalize it from the other point of view. If it were up to me, the Guard would have been there by now in force.
I mean most of us have seen the videos of corrupt Mexican Army personnel crossing the border protecting whichever drug cartel is paying them. The Border Patrol can't do a thing against a small unit of Mexican Army with assault rifles. The National Guard could cure that problem in a second.
Or we could do it the Carlos Mencia way, have all the illegal immigrants build a wall along the border, when it is done... have them go across and see what the other side looks like and slam the door behind them.