A quack can also be someone who knows better, but choses to sell snake oil because it is easier than actually practicing medicine
and it makes them more money.
None of which has much to do with Thomas Cole, whose work
The Course of Empire I thought might be of interest to some of the usual suspects here at Ian's Pub.
Best,
No, what you're defining is someone who is unprofessional, unethical, etc. It doesn't make them a quack. For example, a lawyer who makes questionable practices in spite of knowing it's wrong, is still a lawyer until he is disbarred, and not a quack, as long as he still have the qualifications.
Here's a definition of quackery.
According to dictionary.com
Quackery is the promotion of fraudulent or ignorant medical practices. Random House Dictionary describes a "quack" as a "fraudulent or ignorant pretender to medical skill" or "a person who pretends, professionally or publicly, to have skill, knowledge, or qualifications he or she does not possess; a charlatan"
Notice the words fraudulent, ignorant, pretender to medical skill. Quacks pretend to something they don't have. Using it to history, it is those historians that pretend to be historians, but don't have the qualifications.
By its very definition, if you really have the skill and training of something you
claim to have, regardless of how you use it, even if it's unethical, you cannot be a quack, since you are what you claim to be.
You admitted that Dr Ferguson had those qualifications of a historian, therefore he cannot fraudulently claim that he is a historian.
Anyway, I don't think Dr Ferguson's qualifications as a historian can be questioned, unless you want to claim that he fraudulently obtained his degrees. The conclusions that he reached from his books can be, of course be questioned, but not the fact that he is a historian.
As I said, once you get the status of a historian, I don't think you can lose it unless you were specifically convicted in court of something like what David Irving did, or his degree in history was revoked.
The reason I dragged this discussion for so long is because I don't think you can simply say someone isn't a professional anymore just because he wrote something not up to your standards. Doctor Ferguson has earned his status as a historian, and it would take more than a few polemical books, in my opinion, to remove that status.
As for Thomas Cole, I broadly agree with the cyclical history view of things, well, as regards to nations and empires. Nations, Dynasties and empires rise and fall, then another nation and empire takes it place. Some of those happens very fast, others would take a long long time.
However, the broad historical processes of history is not cyclical. I don't think we will revert back to the Stone Age anytime soon. Even in a nuclear holocaust, enough knowledge in the form of books would survive to make sure that we won't be set that far back.