It is only in hindsight that the President's response appears slow. At the time of the first US outbreak, several other countries had also yet to take steps to combat the spread. The UK, for example, took a 'herd immunity' approach.
UK Prime Minister Boris Johnson based this soft approach on the possibility of '“behavioral fatigue”—if restrictions come into force too early, people could become increasingly uncooperative and less vigilant, just as the outbreak swings into high gear'
At this point, other European nations had already introduced strict lockdown measures. The dangers were evident. And yet, this strategy sustained for weeks.
Trump cannot be held accountable for the spread. He was hardly the only international leader to realise just how destructive the virus would become, until it was arguably too late.