Not if you're a DemonRat staking your future on race-pimping.
Ensuring that immigrants are always of some other ethnos than the dominant one in the target country guarantees that your services as a 'Rat Pimp will always be in demand, since social tensions will always be on high simmer, if not boil.
Unhappy people make for happy, fat 'Rats. They gorge on our troubles and feast on social conflict. And they run up and down drainpipes all day, and nothing ever sticks to their shiny, glistening fur....
Bring me ferrets. Millions of ferrets.