this will hurt business. this will hurt american companies. this will hurt the country.
this will not catch any terrorists. this will not catch any serious drug traffickers. this will not be socially useful.
i can't make it any more clear.
the more this country outwardly projects "we're a police state, and people from other countries are unwelcome" the more isolated we will become and the more backward our peers will find us to be, and rightly so.