This isn't a modern problem. If you read Thucydides you'll find that cities were often betrayed by a small, radicalized percentage of the civilian population hi

This isn't a modern problem. If you read Thucydides you'll find that cities were often betrayed by a small, radicalized percentage of the civilian population hiding in plain sight. Their solution was sometimes to kill all of the men and enslave the women and children. Obviously this wouldn't fly today, but I imagine that a nation like China might simply surveil everyone, sending anyone suspicious to concentration camps. That seems like effectively the same win condition; making it effectively impossible to resist.