It's appalling how people pretend that they don't have anything against immigrants but they are against illegal immigrants as if the paperwork for legal work is a natural phenomenon and they can't do anything about it.
You've just given me a great business idea. Votes for hire. I bet I could charge a fortune, and I would only have to pass a small fraction of that on to the immigrants I employ.
To be clear, as suggested by the rest of your comment, it is currently not allowed due to various political reasons. Nobody is arguing ideal situations, only reality.
There are probably many million starving African desperate to work a job like trash-man or food packager. Competition for lower skilled jobs will become fierce, but I guess competition is a good thing.