Protecting the community from being exploited by psuedo-scientific charlatans?

The FDA is actually redundant in that respect. We already have institutions like the AMA that decide who can give medical care and how it can be given.

If the FDA has a function, it should be safety evaluations and data keeping. Because if we know a patients background information and what drugs they took and what their outcome was, we can rationally decide which drugs work and how well they work. And if the effect is so small that it could be a placebo, it's probably a shit drug. No reason to spend billions of dollars just to decide if a drug is marginally better than shit. It's much more efficient to just do safety evaluations and then have drugs compete head to head by reviewing the patient outcome data, which is something doctors have to do anyway even with the FDA.