Why the left needs a continuous flow of immigrants from "spithole" countries

All is going according to plan:

"They will bring with them the principles of
the governments they leave, imbibed in their early youth;
or, if able to throw them off, it will be in exchange
for an unbounded licentiousness, passing, as is usual,
from one extreme to another. It would be a miracle
were they to stop precisely at the point of temperate
liberty.

These principles, with their language,
they will transmit to their children. In proportion
to their numbers, they will share with us the legislation.
They will infuse into it their spirit, warp and bias
its direction, and render it a heterogeneous, incoherent, distracted mass."
—Thomas Jefferson, "Notes on the State of Virginia" (1785)