I think it's utterly hopeless. With billions of humans, there's no way to get everyone to agree to do the right thing, both with doctors and especially patient

I think it's utterly hopeless. With billions of humans, there's no way to get everyone to agree to do the right thing, both with doctors and especially patients. You just need a small fraction doing the wrong thing for something bad to evolve: look at Covid, for instance. That simply evolved somewhere at one point in time in one place, and then spread like wildfire.