[brobdingnagians]

"But medicine has a long history of people being rather convinced of theories that made an awful lot of sense and killed an awful lot of people."

That works for both sides, both the true believers and the skeptics. Both sides are absolutely convinced that they are right and the other side's belief will kill people. At least one side is wrong. Both have their reasons, both appeal to history, both appeal to science. It is a confusing time to live.