I might agree that some people have overdone bringing in relatives.  However, it is not by having anchor babies...which this law is not actually addressing.   The largest number of anchor babies are Chinese.  Thriving business in parts of Ca. and it is the more affluent among the Chinese who do this.

Nonetheless, the goal is to reduce immigrants in general (something that might be based on xenophobia), and to greatly reduce the numbers of immigrants of color.   I imagine there is some reality to the idea that the countries of color are more wedded to extended family concepts than North Europeans have traditionally been.  And clearly there are more people who will have to learn English while they are toiling in American fields and hotel kitchens coming from countries that both have greater poverty and greater negative stereotypes attached to them.