He and the Republicans in charge have stripped the essential roles in government and left important, critical positions vacant for years. All to fast break judges onto the federal courts and spend on pet projects like The Wall. Add in the insecure nature of this administration and state departments, the terrible leadership of Trump, and this feels like an epic disaster of incompetence occurring in realtime.
The UK Government believes screening on entry to be both ineffective and also dangerous. Screening can create false negatives and give people a belief they are okay. They then go out there and spread the virus unknowingly. The UK government has instead insisted that anyone returning go into isolation. Often the best options don’t necessarily appear to be the most logical.