And we worry about Mexicans ....
Damn time we worry about everyone... The PLA is everywhere !!!!
Where are my meds???
The problem is with open borders is someone nefarious will bring in something nefarious. Kinda like when old sam b laden prophesied about 50 American Hiroshimas, they'd use illegals to backpack in some suitcase nooks and then slot the backpackers so they'd never be able to talk. Or when they bring in nice shiny stainless steel containers filled with miltarised anthrax and plague.
On the chicom int agencies and their nefarious plottings, China doesn't have 4 int agencies, it has 40 million.
Say you're a mid level manager at China Stolen Technologies Partnership LLC, and your boss says some people's enslavement army navy brass wants to talk to you, do you tell them no? Chinese who tell the people's enslavement army navy no get the bill for the bullet to their head sent to their closest relative.
So the people's enslavement brass walks in and says you will go to the US and partnership with specific industriomilitariocomplex corporation and get us this technology, as is your duty as a good comrade.
As a mid level manager you know full well your entire company is a utter fabrication of the people's enslavement army navy and every yuan/renmimbe comes from the people's enslavement army navy, so you go to America and steal this technology. That's not to say there aren't people in America, Chinese background or not, who hate the country enough to spy for cash or ideology or anything.