Any working therapy eliminates the Emergency Use Authorization. Hundreds of billions of dollars in extra profits would have been lost. So, they have to knock down every alternative.
Money for Big Pharma, Power for the Politians, an Economic Boon for China, Only HCQ and IVM stood in their way, so they had to destroy them.
Bingo!!! They could not admit to a cure- if they had no vaccines and the loss of billions of $$$$ to big pharma