A responsible man would have advocated for clinical trials, the only way to know if any drug actually does what it's supposed to do. There are dozens of drugs, experimental and repurposed, that show activity against SARS - remember there was that epidemic in 2002, and since then people looked at the virus, knowing it was going to be back.

But Elon Musk is not a responsible man. He is Mr Foot-in-Mouth on Twitter many times over.