Where did you get the idea these illegals were "starving"? Most pay from $1500-3000 to a smuggler and have cash to bribe Mexican officials they meet along the way . Arizona is littered with Nike shoes and Adidas jackets and thermos containers. The ones who are starving can't afford the cost of entering the USA.
You are totally right. I have never seen a starving Mexican and I live on this border. As a matter of fact, most Mexicans are obese rather than emaciated.