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.
There was a lot of wishful thinking and denialism back in January/February 2020.
The only country that got the initial response right was North Korea, they shut all their borders, and were mocked for it too.