Immigration at the moment is helping to destroy the USA. There should be a halt on all immigration until the USA achieves something close to full employment.
The suggestion that immigrants do the work that Americans don't want is not viable in the economy's current state.
Lastly, it is absolutely retarded for people to compare Arizona to Nazi Germany. Every country has immigration laws. Mexico has immigration laws, and Mexico treats their illegal immigrants from the rest of South America in an abysmal third-world manner. All Arizona is doing is trying to enforce the law.
Bottom line is, if someone is not in the USA legally, the person is not an immigrant but rather a law breaker.