Do those people really believe they're the most intellectually superior to the rest of the world? If a job can be done purely remotely, what stops the employer from hiring someone who lives in a cheaper place?
In my experience, pre-2015 or so, offshoring was limited in its utility. Communication was a bitch because videoconferencing from everyday laptops wasn't quite there yet, and a lot of the favored offshoring centers like India had horrible time zone overlap with the US. And perhaps most importantly, companies as a whole weren't used to fully supporting remote colleagues.
Now, though, if I interact with the majority of my colleagues over Zoom/Teams/Meet anyway, what difference does it matter where they're sitting? I've worked with absolutely phenomenal developers from Argentina, Poland and Ukraine, and there was basically no difference logistically between working with them and American colleagues. Even the folks in Eastern Europe shifted their day slightly later so that we would get about 4 hours of overlap time, which was plenty of time for communication and collaboration, and IMO made folks even more productive because it naturally enforced "collaboration hours" vs. "heads down hours".
I understand why people like remote, but I agree, US devs pushing for remote should understand they're going to be competing against folks making less than half their salaries.
The lower salary can be offset by the lower need for money when you don't need to buy your lunch, you don't need that expensive car to get to work and so on. The time you used for commuting could instead be spent working for another company part time.