Bingo! People think their doctor should know all and be all. When really it's all about the quality of the info you/tests give them plus how good they are at staying up to date and remembering all they have learned...not easy. A patient armed with misinformation can lead a doctor down a wrong path and hide the truth about what is fact. Doctors have to listen carefully to what is being said and not just take what the patients words as absolute but a guide line.
But it's not all "good doctors mislead". Doctors often think they know more than they do, and they often cruise through when they should pay attention.
I've saved my own life more than once despite my doctor.
Catching when that antibiotic they prescribed was one I was allergic to.
Pushing for a CT scan when my doc didn't want to do one (turns out I had lymphoma. The CT scan and later biopsy found it).
Then there was the time when I called in with the symptoms of appendicitis. I didn't know that at the time. The doctor wanted to give me an appointment in two weeks. I ended up in the ER for the pain. He should have sent me there in the first place.
Serious illness (doesn't everything have "flu-like symptoms"?) are often overlooked. Follow-ups are not done. It's almost never that I've had a doctor say "here's what I expect to happen, and here's what should cause you to come back in in this timeframe".
Don't get me wrong. There are some excellent doctors out there... but I've had to go through a lot of bad ones to find them.
Your health *is* first and foremost your own responsibility. I agree with the OP, that people should be careful of their sources... *all* their sources.
Tens-to-hundreds of thousands die every year from medical mistakes and wrong diagnosis... and yes, many more die every year because they didn't go to a professional in the first place.
PS. My absolute favorite doctor has sentances like "here's what I think it is, here's why, here's what else I think it might be, here's what I want to try , here's why, this is what will happen if I'm right, this is what will happen if I'm wrong, and here's what we should look for / do next if I'm wrong. What would you like to do?"