Ask HN: Privacy During Emergency Situations

In situations like the Coronavirus outbreak, data companies like Google have enormous amounts of useful data; user locations, contact lists, familial associations etc.

One can easily imagine Google having the ability to provide the CDC with localized information where given a list of infected individuals, provide a list of high risk individuals that should be contacted.

FB may have the same capability.

Is this a reasonable idea, or are there not immediately obvious drawbacks to using data this way?