When you prescribe a new drug, often you are prescribing something that has only been tested in a few thousand people for a very short period of time, perhaps only six months, and that's not long enough to know whether there are any medium- or long-term side effects.
There is actually quite a lot of crossover between the quacks and drug companies. They use the same tricks and tactics to bamboozle people into buying their pills, but drug firms can afford to use slightly more sophisticated versions.
Yes. I'm a doctor, an epidemiologist, and lots of my professional colleagues flip back and forth between industry and medical roles. I know them; they are not bad people. But it is possible for good people in bad systems to do things that inflict enormous harm.
I spend a lot of time talking to people who disagree with me - I would go so far as to say that it's my favourite leisure activity,
You cannot reason people out of a position that they did not reason themselves into.