Even Italy, the epicentre of Covid in early March did not lockdown until March 9th.
Not really. Italy had a major breakout in a small area that they locked down on 21st February. This failed to limit the virus to the area, so the area was subsequently expanded. It was a demonstration that local lockdowns don't work.
During those last 2 weeks in Feb, it was apparent the impact of covid was having on one of the best health-care systems in Europe which led to the Italian lockdown. All of the evidence was there even for those unable or unwilling to consider the picture that had emerged from China far earlier.