First, I am a practicing Catholic.
Second, if these Catholic Bishops want to urge "social justice" (which they should), they should be looking at the grave injustice being done to those who are following the rules and waiting their turn while these illegals push them out of the way. And then they should be addressing Vicente Fox to correct the economic system in his damned country where all the wealth is held by the ruling oligarchy and the people are driven to flee.
As far as I'm concerned, a statement by the Bishop(s) is just that - a "statement" which does not have the authority of Church teaching to compel my acceptance of it.