> "identify the people at high risk and protect them from the virus. People at low risk should be expected to circulate the virus and develop immunity." Well,

> "identify the people at high risk and protect them from the virus. People at low risk should be expected to circulate the virus and develop immunity." Well, sure. That is what has been happening anyway. But it's hard to keep the low risk people away from the high risk people all of the time. Or are you really not going to ever visit grandma again, potentially for years? So, even if you're low risk, it helps to know if you've been exposed so you can isolate yourself and protect the high risk people.