March 11, 2020 -- Trump: "We will have a vaccine very soon."

March 31, 2020 -- Fauci: Expect a "second wave" in the fall

April 3, 2020 -- CDC: Wear a mask in public.

 
 Thinking historically, what should have been the consumer's basis for the most trustworthy claims?
Evidence, arguments, or expertise?
Personal judgment or reliance on experts?