Just a tough reading the news about Madonna endorsing hydroxychloroquine.
The problem is when one has to judge the difference between distributions that differ in the tail, like a Bernoulli with p=0.95 and p=0.99.
People, individually, don’t have experience for that, only “big trials” can distinguish between a treatment for coronavirus that leads 95% to recover and a placebo where 90% recovers.
The same for homeopathy: flu/colds are largely benign, it is really hard to judge the progress of a “real” medicine.
In all these cases fake treatments that exploit these cognitive bias can emerge.