Three observations:
1) There was a reason Ellis Island (and other places) existed as a receiving station for folks arriving from other countries. The combination of medical exams and quarantine helped bring a number of communicable diseases under control. The receiving stations "cost too much to operate", so they went away.
2) Once upon a time, we had a *large* US Public Health Service which operated public hospitals and clinics as well as serving as the front line in battling communicable diseases like TB. Over time, it has been reduced to a mere shadow as it "cost too much money".
3) Alternately in places like Alaska, the folks who cared for the sick and helped to battle the Great Flu Epidemic were the <ahem> "Good Time Girls". They stepped up and risked their lives when the "respectable folks" refused to risk their lives. Which may prove that judging people isn't as simple as it would seem.