I disagree. It's Bush experience in Texas and his brother's marriage to his mexican wife that causes Bush to be so enamored of mexicans. Or, his first "experience" was with a mexican maid.
I do believe it's all personal. He feels more obligation to Mexicans than to Americans, and thinks he can make a "gift" of America to soothe his anguished nobless oblige--and, who knows, his droit de seigneur/