oh come on, you know better than this, surely? The problem isn't the tiny number of current cases, it's the risk of a much larger spreading of the disease to wider communities. As such, both major international airports and public transport are especially important. And when one of them is ludicrously overcrowded, so that if you sneeze you're almost obliged to do it into someone else's elbow, the dangers should be pretty obvious, and the elected official with most up to date knowledge is more important than any other city mayor.