Completely non-responsive.
Prior training and certification are important elements of quality control. The unions’ primary concern isn’t quality control, it’s extracting economic rents from employers. And that’s never a good thing for airlines, passengers, or the economy.
And according to the story many, perhaps most, aren't trained or certified - not in the U.S. or anywhere. So in your view it's OK to use them as labor rather than the trained, certified, and experienced U.S. counterpart for economic reasons alone?