Cardinal Carrera's statement and that of the Bishop's in the U.S. sound just like the Liberation Theologist's of the 1960's and 1970's. They have just transfered the Marxist philosophy across the border. Read Cardinal Ratzinger's comments about liberation theology and see if it does not apply with Carrera and other U.S. Bishop's regarding immigration.
http://www.christendom-awake.org/pages/ratzinger/liberationtheol.htm
Liberation theology is a scourge growing in the Church from the Latin American countries, courtesy of the Marxists who permeate down there.
Not to mention the 'racist' comments coming out of Latin America after Ratzinger was elected Pope. Because it wasn't a Latin American elected, many spoke out against his heritage, and felt that he would not speak for the Latinos.
If I can dig up the thread, I'll post it.