Since it is a pandemic, the spread of the virus is inevitable. If we would quarantine whole cities too early, or take other measures too early, it would just hurt us economically and push the problem forward. It's all about all about timing now and flattening the curve, which we have under control at the moment.
I am proud of our government taking decisions based on the public health authority's recommendations which are based on science. Compared to some other countries who take decisions not based on science (e.g. Denmark closing it's borders at the time was not recommended by their public health authority).