There is no dichotomy here. I've already told you I don't consider myself a "nationalist" at all, and I gave you a specific instance in which I would diverge from standard-fare "nationalism". In other words, the mere fact that one is not a "civic nationalist" does not make one a "white nationalist". More generally, you really ought to stop with the labels. Labelling people in the way that you do is sloppy and leads to incorrect conclusions about people. It also violates the humanism you claim to hold dear.
What's your evidence that my desire to secure the southern border (~400,000 apprehensions of illegal aliens per year, thousands of cases of human trafficking, millions of dollars of illegal drugs coming across) is not held in good faith? Your primary evidence seems to be that I hold a different view from you.
As for "American restrictionists generally", there you go again. You're explicitly generalizing about the motivations of a group of 10,000,000s of Americans. It shows disdain for your fellow man. Worse, it's inaccurate.
You believe in cultural compatibility too. Everyone with a lick of common sense and life experience does.
I'm writing to you from the Far East. Over here, there are undeniable cultural differences with the West. Religion, views on health/medicine, holiday celebrations, marriage, standards of beauty, ethics/morality, sports/games, and language are just a small sample. Yet the divergence is not too great to overwhelm these crucial areas of overlap: belief in the nuclear family and monogamy, strong emphasis on schooling, separation of religion from government. I want you to answer this question: Do you agree or disagree that the average East Asian's cultural beliefs are more compatible with the average westerner's than those of a believer in Sharia who practices
female genital mutilation? I'm guessing you'll refuse to answer.
Every time you conflate illegal and legal immigraiton in this way, you are effectively strawmanning me. My claim is that illegal immigration is a net negative for our country, while legal immigration can be a net positive.