Yet the harm from that (10,000) was in many ways tiny compared to the harm from
not deploying treatments that turn out to be good.
For example 780,000 people died of polio between 1988 and today. Yet for all that time there has been a cheap, low risk, well tested, near 100% effective vaccine (many in fact). And polio is probably one of the better cases because governments and charities have been pushing it pretty hard.