There is no convincing some people, there has been too many years of conservatives/populists (including right wing unions) telling them the economy is a zero sum game. In reality, the deportation of even 1m would plunge the economy into recession, businesses would collapse from lack of key workers, capital would move to where cheap production was possible, etc.
It's the same with income tax cuts -- someone things their $500 tax cut is great, but ignores the $5000 tax cut those on higher incomes (whether wages or company/real estate ownership) receives, and then complains when there are more homeless people and schools can hire enough teachers. It's bait and switch on a generational scale.