In fact, based on the initial footage from Wuhan, countries should have adopted more stringent protocols when they repatriated their nationals, i.e. quarantine on arrival etc... If in doubt throw everything including the kitchen sink at just to be sure. But it is what it is. I just hope we've learnt from this and are prepared for the next one.
The disease was already in curculation in Europe and the US when we found out about it.
Its outcome will change the way we travel for years to come just like 9/11 has.