No it isn't. It's very hard to find Americans willing and to work hours past a normal shift with little to no protective gear in a workplace that makes OSHA look like a bedtime fable.

Put workers in shifts, give them gear, and stop asking ridiculously dangerous stuff, and you'll find plenty of Americans willing to work the job. The Meat Packing industry is the perfect example of this because they were hiring Americans. Then they decided immigrants were cheaper and they raised the price. This idea of them passing the savings along is literally marketing material. They aren't dripping prices unless the market forces them to do so.

It was always the boss versus the workers.