An important topic. Please note that zoonotic spillover is STILL the leading theory.

As to why cover up? It is because we humans are naturally defensive about our responsibility.

(to scapegoat is human psychology)

Calling it Kung Flu, or China virus, is insulting and suggests blame, spreads Asian hate.

SARS, MERS, Ebola, Bird flu, swine flu, BSE, E-coli, and many, many more DO come from our relationship to animals, both CAFO, and in habitat disruption. SARS has been studied closely now for close to 20 years. The reason we look into alternative theories is to help confirm one way or the other--without accusation, as you point out.