So much has been said about how a failure of conservatism is to not recognize the existence of nations, or how they tend to treat people as economic units instead of members of nations. So I feel no need to add my voice to that. But what I do think is interesting is that if you take the process of Californication, which most conservatives do, and then apply that principle to immigration in general, Conservatives have even more reason to be against immigration than the Alt-Right.
The Alt-Right believes that nation and race are tied together, and that people from some races that form very different nations will have difficulty assimilating. And so they fear that importing large groups of people from nations that don't assimilate well will ultimately destroy the american white nation. Preservation of this nation, is their goal. And so when it comes to immigration from somewhere like the U.K., the Alt-Right isn't too worried about it.
Conservatives on the other hand believe that traditions are important, and conserving their way of life is their goal. So if take the principle of Californication, which is that people take their politics with them when they move, how many immigrants are going to be conservatives? If a man values his countries traditions and wishes to preserve them, why would he leave? By the very nature of the fact that they are immigrants, immigrants are not going to be Conservative, regardless of where they come from.