All the ANSP's went for the safest possible cause of action based on the information that they had, which is the whole point of of the ANSP, to provide the safest possible air traffic service they can. It is then up to the regulators, CAA, ICAO, etc and the various governments to decide when it is safe to fly.
The safest option is always to not allow anyone to fly
One might wonder if zee Govt is in a better position to make that decision than the Companies, the pilots and the PAX.