While this is something that may be possible for you, I think what the parent is saying is that most people lack not only the desire and willingness to do their own research, but also the general knowledge of the topics to fully comprehend what it is they're reading.
While doctors do typically go to school for a more 'general' understanding of any given disease, they still have a great more background on the subject than the average person, which probably helps them differentiate (to an extent) between the signal and noise of any given research paper that someone researching may come across.
The same could very much be said about software. To a non-technical person, searching about 'why you should use Windows vs Mac' could be pretty fruitless. Sure, there's plenty of information available, and numbers can easily support one or the other, but do you actually know what those numbers represent?
Now, I'm not saying that patients shouldn't be able to see their records, nor that they shouldn't spend the time learning about any conditions they may have (though I won't claim that I have), but I don't think we should discredit the knowledge that your average doctor has about your health.
Distrust of your healthcare provider isn't exactly healthy either. And again, as to your last point, can you elaborate? I'm assuming your referencing something to do with depression and obesity, as you mentioned in your original comment, but you haven't really mentioned what it is they're failing at.