It won't. Screening all arrivals is helpful, but just shutting down travel is going to end up creating a whole new class of problems.

Medical officers (and Italy) tell us that screening arrivals doesn't help.

I was thinking more for data gathering purposes and so on before the healthcare system collapses under the weight of exponential growth. But I take your point.

Every little bit also has a cost, and it's possible for the cost to outweight the benefits, especially when a decision is made without even considering the cost.

True and fair point with which I agree. I don't know all the considerations that went into this decision but I lean towards supporting such plans that limit unnecessary chances for exposure