This is a very confusing issue for a lot of people. They just cannot understand that our government in general wants open borders and cheap labor. They ignore the elephant in the room. The truth is there for all to see, yet they refuse to admit it. Socialism will be forced upon us as a result. It will be a boon to elites from all parties. It is just a hard sell to the people who believe America to be and stay a sovereign nation. As a result, they have to sell the notion that those who wish to protect our borders and enforce the law are racists and selfish bigots. Some people like to fancy that those who see the elephant are conspiracy people. To be a conspiracy, the elephant would not be there for all to see. My challenge is to ask those who just don't understand why our leaders refuse to enforce laws and protect the borders why they think this is so. There is a reason, so what is it?
You've raised so many interesting questions and problems that time and space prohibit me from giving all my conjectures. I don't pretend to have any definitive answers.
I think part of the answer is the failure of our public school education in the last generation. We have poorly educated students and poorly educated teachers teaching them. The NEA and other teachers unions are simply part of the Democratic establishment who are more interested in lobbying for better "packages" than in better teaching.
Their main concerns have been higher salaries, guaranteed tenure (regardless of any competence), smaller classes (= more teachers with no evidence of better performance), opposition to all objective tests which evaluate teacher and student ability, performance, and progress.
These trends have been going on at least since the 1960's and have resulted in PC instruction, blame America for all its past faults and failures, feel-good, no sense of personal responsibility, or accountability. And - God forbid! - no judgments about right or wrong, good or evil.
Combine this with parental indifference, abdication of personal responsibility for inculcating their children with religious and moral values, a society that encourages and glorifies sexual excess, violence, and immorality -- and you have where we now are.
This (in a very convuluted way!) gets to your questions about "open borders" and cheap labor, racists, bigots, etc.
The fact is (I believe) that a whole generation of Americans is no longer capable of discerning paramount moral, political, and economic issues in any meaningful way as they affect our society or, indeed, Western civilization.
In other words, they lack the educational background knowledge and the mental gravitas to even seriously address the problems you mentioned. I've gone on for too long but I'd appreciate your thoughts.