This probably isn't a good analogy, but there used to be a veryi different manicurist industry than we have now. It was a respectable, good job for many of our citizens. The people who have taken over the industry, most all from Viet Nam or Cambodia, are no doubt legal, but have cut prices and often have unlicensed people working in their shops.
I'd be glad to pay more for the way it used to be, but the industry has changed so much that it's probably too late to go back. Sanitation can be a problem when a shop cuts corners, but the state inspectors don't want to alienate "the community", and they are too few to help. People were seduced by cheap prices (as with the nannies) and took the options away from the rest of us who would have gladly continued to pay more; an entire industry has been radically changed and made user-unfriendly in many cases, at least in my area.
Look at the hardwood floor industry. Americans can't compete with the illegals.