This is the predicted Immigration Police State.
Since the populace is no longer bound to each other by national or ethnic ties, but in fact is made up of peoples totally hostile and foreign to each other, the only thing that will hold the “nation” together is force.
Such a volatile mix will eventually combust, as the entire history of the European empires in the last 2 centuries has shown.
The Statists believe that an all powerful Surveillance State will keep this from happening.
But it’s only a matter of time.
Absolutely, the left knows very well what legal immigration means to the West.
I believe it’s called ‘balkanization’.