Don’t be obtuse.
This whole discussion has been sad from you, starting with the supposition that migrant workers MUST obviously be illegals. Sad OB, quite sad.
As I said, I didn't read the rest of it. So, I don't really know what you are objecting to.
Yes, since 90% of migrant workers are illegals, the only possible words to describe my assumption is "sad" or "quite sad". Well stated.