My behaviorist wife and mother (Freud would have something to say about me, wouldn't he) would tend to disagree with your first statement (overdiagnosis) with the caveat of "within certain populations." We focus a lot on kids, unfortunately often under the age within which the DSM actually supports these sorts of diagnoses.
I would personally disagree with your "medications are not specifically harmful in a misdiagnosed case." I'm not encouraging people to avoid seeking whatever help they see fit, but rather to not whitewash over the very tractable impact it had on a rather dark year or two of my childhood, and the lasting aftereffects. I honestly don't want to start a heated debate about whether or not to medicate, moreso call out to others who had a similar negative outcome that they're not alone and that it's not impossible to develop healthy coping mechanisms without pills.
I would personally disagree with your "medications are not specifically harmful in a misdiagnosed case." I'm not encouraging people to avoid seeking whatever help they see fit, but rather to not whitewash over the very tractable impact it had on a rather dark year or two of my childhood, and the lasting aftereffects. I honestly don't want to start a heated debate about whether or not to medicate, moreso call out to others who had a similar negative outcome that they're not alone and that it's not impossible to develop healthy coping mechanisms without pills.