You seem to think that employers resent their workforce.
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Not at all. They DO resent paying more for expenses, no matter how great their profits. And if they could get by with fewer employees, they would certainly do it.
Not all, probably not even most, tax reductions would be used to hire more people. They could use their extra money to buy robots or other machinery to produce more without increasing the payroll. They might even use it to move the headquarters to Bermuda, Sark, the Caymans, or to set up a new factory in China.