The right argues nonwhite immigrants from the global south were brought in by capitalist elites for cheap labor. While this is accepted as a fact by both sides to some extent, the left sees global south people as the proletariat of the world, while white first worlders are the bourgeoisie of the world, and the white working class of the first world are also seen as inherently anti-communist, due to the absolute failure of any communist movement in the first world. So if the west becomes populated by mostly global south working class people, there would be a higher chance of a communist revolution.