And economics has no concern about the well-being of any social group.
If another social group creates more wealth than yours do via immigration, guess what? Your social group dies.
If a bunch of marauding dark-skinned anti-gay Muslims practicing Sharia law creates more wealth than sweet, huggable white libertarians with flowers in their hands, guess who's going to dominate?
There's no faking it in economics. Adapt or die.
And white nationalists are going to learn the hard way that immigrants are what creates wealth in this country, since they work hard and have a lower crime rate than natives.
The left, however, is a real thing. When I worked with Obama's people, I worked with people that identified as "anarcho-socialists" that openly discussed entitlement expansion as a means to break the system. I could not invent the crap I heard these people say.
We have to make sure that white-nationalism is purged from this country, and an open-borders society is probably the best way to fight-off white-nationalism.
We need to make sure a Sharia-law supporting Muslim is able to freely immigrate into this country and sit freely and peacefully alongside a Brazilian transgendered activist on our subways.
That is the multiculturalism that we Americans want.
I get that you have an opinion and it is fairly orthogonal to mine. Your opinion doesn't offend me or make me feel threatened, but the presumption that you speak for anyone beyond yourself is awkward.
I want to understand your side, but your presentation is pitting you against good taste... I feel like I'm talking to that guy at the gym who went off his bipolar meds.
Tone down the preaching of universal truth, perhaps?
Edit: wrt your 'A', there is a massive amount of things not said about how immigrants take on the values of their new country. Cato has published a few papers on that and it is always in the context of large aggregate stats dominated by immigrants from similar cultures (some might disagree, but Mexico is VERY similar to the US; Syria not so much)