Facebook Singapore Office Remains Open, Despite Covid-19 Confirmation

To those stateside whose offices have already mandated work from home despite not having any cases, what do you make of this? Some offices have been shown to have confirmed cases in their office, yet are still requiring butts in seats.

It has been shown that the virus can remain in air ducts for several days.

What is the advantage of this?

https://www.nst.com.my/world/world/2020/03/572485/facebook-shuts-singapore-london-offices-after-covid-19-case