Illegal aliens are better off in the U.S. doing lousy menial jobs than they are in their own country. Illegal aliens pay taxes that benefit the economy. But here in California it hasn't. For example, the feds had to bail out the L.A. County hospital system several years ago and the county hospitals are now again headed for another crisis. The evidence shows that the net results are that illegal immigrants cost the taxpayer significantly more than they pay in taxes.
Illegal aliens have a good work ethics.
If it means that illegals will allow themselves to be exploited, then they have a good work ethic. If it means that a group of day laborers would be consciences in the assembly of precision built automobiles, it might get an argument. Illegal aliens don't affect politics because they can't vote. Just by being counted in the census, illegals give political power to special groups. Many illegals fraudulently vote anyway and there is strong evidence that some key elections have been upset by illegal voters.