Ah, but the problem is that the Mexicans are like us in many ways. They assimilate quickly. They value our freedom, our reward for effort, our religious values (where they still exist). The Muslims are not like us at all. I will take 10 million Mexicans over 1 million Muslims any time. Although I would rather take none of them.
Um, but you have already taken 30 million Mexicans and are on the way to taking 30 million more.