This assertion is false.
Generally speaking competent governments routinely do threat level risk assessments.
For example previous UK governments produced comprehensive pandemic response plans:
https://assets.publishing.service.gov.uk/government/uploads/...
https://en.wikipedia.org/wiki/Exercise_Cygnus
In the US the Obama administration produced a pandemic playbook.
Obama gave speeches highlighting the threat of pandemics and left a fully staffed pandemic response team:
https://www.snopes.com/fact-check/obama-pandemic-preparednes...
However:
https://www.politico.com/news/2020/03/25/trump-coronavirus-n...
I hope this is not seen as a political attack but presentation of facts.
Some governments are simply more competent than others.