First off, anyone who violates Title 8 US Code 1325 is a criminal. Period. Anyone who crosseS the boarder illegally is in violation of this law. They are not migrants. They are not refugees. They are criminals. These criminals are a burden to the system and therefore a threat to American QOL.
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Furthermore, while Illegals do inject money into the economy via cheap labour, they extract far more than their total value out of the system.
Proof:
https://budget.house.gov/imo/media/doc/the_cost_of_illegal_immigration_to_taxpayers.pdf
Cheap labor fuels industries Agriculture, construction, and service sectors rely on undocumented workers. Deport them all overnight, and watch food prices skyrocket and businesses collapse