With American employees the employer has to pay FICA and insurance and other benefits and hire a bookkeeper to figure w/h tax and print out the employee paychecks and file truthful state and federal income tax and .... Yep, so much easier and profitable to hire illegals.
And we can't possibly ever entertain the idea of maybe just getting rid of all the government regulations and taxes. There are tens of thousands of government employees whose livlihoods depend on shuffling the paper generated by them.