you said "smarter" in this comment when a more accurate term is "corrupt". Being unable to find a candidate for your given budget requires that you either increase the budgeted salary or decrease the requirements, and train on the job. If you cannot do either of these, your company MUST fail. It is inhumane to demolish the US working class by importing foreign scab labor. Too much labor supply (aka immigration) decreases fair market value for wages. That alone is more than enough justification for ending all immigration of any significant amount.
Handwaving away significant issues as "bigotry, etc" is unhelpful to the discussion. We haven't even covered the impact on housing supply, as illustrated by Canada's insane valuations.