If all of these arguments are valid. if you cannot identify these people. if you cannot separate Americans from Mexican nationals how could that promise to sponsor this legislation have been made in good faith? I believe these arguments are specious. I think they are made by people who want to hire the wetbacks and who do not want to be forced to rely exclusively upon legal contract labor. Mind you. if they are willing to rely exclusively upon contract labor they do not have to worry about the penalty for use of wetbacks because it will not affect them.
Identified stereotypes
Using the derogatory term 'wetbacks' and implying employers only want to hire them to avoid legal labor costs.