The people of Arizona approved a law requiring evidence of citizenship to vote. They are the ones suffering the worst effects of illegal immigration, not those of us in California.
You note that the U.S. 9th Circuit Court of Appeals concluded that voter fraud in Arizona is not a "significant" problem. Must it be "significant" to do something about it? There should be no voter fraud at all. And who today in this country does not have a Social Security card or some form of photo identification? Even babies have Social Security cards.
You say the Supreme Court should strike down the Arizona law, and in the past, you have complained about low voter turnouts. People become disillusioned when courts overturn their votes.