re: Why didn't we use the South Korean approach?

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A more serious answer- SK and Singapore and a few other places relied way heavily on the surveillance state. Phone alerts and location reporting and extremely intrusive government intervention to identify and use technology.to isolate the infected, paired with a cultural obedience to central directives. They experienced SARS and other infectious diseases to build a model of intervention that ignored privacy, to the benefit of public health.

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Sounds like you need to read more boards. South Korea is not a surveillance state. And every preventative process you just described, has absolutely NOTHING to do with what methods South Korea actually used, against COVID-19. You need to take your imagination to Hollywood.....