Actually, in the proper context, it isn't. In fact, it's pitiful compared to the increase in wealth resulting from focusing on turning the poor country into a rich one.
THAT'S the biggest economic story of the last several decades; and to first order, immigration is only relevant to the extent that it facilitates more rapid development of China/India/Rwanda/etc. The US electorate is still more annoyed by predominantly Mexican/Central American illegal immigration than the combination of reverse-mercantilist trade policy, foreign student education and practical training, outsourcing, and tech transfer that the US has deployed to facilitate the development of China, India, and many countries before and after them. The total positive impact of the latter is easily >20x as large as the former, higher-cost policy.
You don't get to discount China/India/etc.'s growth as "inevitable catch-up growth" on one side of the equation, yet fully count it on the other side.
As a consequence, I support reverse-mercantilist trade policy, foreign student education and practical training, outsourcing, and tech transfer, especially for countries like India which both have a lot to gain and are strategically highly aligned with the US (I acknowledge that China is now a more complicated case), to the extent that Americans can continue to bear these things. (Canadians and Australians seem to be fine with continuing these practices indefinitely, while also letting a pretty high number of skilled nonwhite foreigners from poor countries settle permanently.) And I violently oppose the grossly inefficient mass-low-skill-immigration policy that threatens to turn Americans, Germans, and others against the overall project while accomplishing so little.