1. Everything does not have a simple answer
2. Gravity appears to be simple, but few can precisely explain its true origin, its often just described only as a "natural phenomenon"
3. Not giving a simple answer when speaking to the masses considering the lowest common denominator viewer, should by itself not be a disqualifier
4. Requiring simple answers can be fraught with unintended consequences.
5. Fauci by most accounts is smarter and more knowledgeable then me, hard for me to judge him on infectious diseases.