It’s quite a luxury for a modern state to maintain – nay, encourage – enormous pockets of pre-modern, anti-state populations. They don’t educate their children; they break national laws because they have no respect for such laws; they impose their thirteenth century sense of how daily life should be lived on a country overwhelmingly either secular or only moderately religious.
In pre-viral times, such populations are a terrible social and fiscal burden; when epidemics occur in communities whose members either don’t know what science is, or disbelieve in it, the luxury of indulging in an experiment to see whether a modern state can sustain itself while allowing massive ignorance and state-hatred to thrive within its borders suddenly reveals itself for the suicidal folly that it has always been.