> No, Immigration isn't going to be sent door to door to do something bad to citizens.

You've got a whole lot of history to read. Because this is exactly what has happened in the past. You don't think this has happened to the Romans? The Russians? The Italians? The Germans? The Spanish?

This is a classic maneuver of a state sliding into autocracy -- if you cannot find enemies outside the state, you find them within the state. Go read Umberto Eco's Ur-Fascism then come back.