Let's say a treatment kills 9 out of 10 people. Maybe those 9 were terminally ill & that's why they died, but maybe the company was just lying and their treatment was doing nothing or killing people more quickly. How do you determine that? When would you shutdown a "death factory"? Would you require mandatory disclosures of the death rate & risks, or could a company hide those facts from prospective patients, only talking about the patients who survived? If they can't show efficacy, should they still be allowed to sell to patients?

I think the ideal of regulation is to try to remove the guesswork & expertise required for the end user to do due diligence. It's not perfect, but at least some minimum level of regulation, such as mandatory efficacy disclosures, would be needed.