Red herring because you don't like my analogy.
I've been in construction for most of my life, starting as a carpenter apprentice, then journeyman, to foreman, to superintendent and as a general contractor. I never asked my workers to do a job I wouldn't do.
As a superintendent I asked one carpenter to assist the block mason by mixing his "mud."
He told me he doesn't do that kind of work because it was undignified. Guess what? I sent him home and I mixed the mud.
One day,after I retired, my son who was working as a carpenter apprentice complained that his boss was always giving him the "dirty" jobs. I told him someday when you're a boss you will appreciate and understand that someone has to do the dirty work.
So it's a false premise that illegals are doing jobs that Americans won't do.