In this article (an English report on a Spanish-language newpaper story), the Mexican consul in San Jose, Calif., says Mexicans who have become U.S. citizens (and, incidentally, sworn to renounce all prior allegiances) are attracted
to dual citizenship in order to be able to use a Mexican passport and thus
avoid anti-Americanism abroad. “There is no rejection of a Mexican
passport. If one has to travel, it’s better to do it with a Mexican
passport,” he said.