It's not about whites it's about Americans and American culture. Look at California. A majority of nonwhite Americans there support curtailing immigration. The real reason so many in government ram large numbers of immigrants in is to smother American culture.
Why? Because it's impossible to assimilate especially when so many groups out there are on patrol to PREVENT assimilation. The reasoning behind that is age old "A house divided can not stand".
It's all part of the plan.