No, I didn't. The issue in the "No True Scotsman" fallacy is not defining "Scotsman" but defining "True Scotsman". The entire apocryphal conversation that led to the fallacy's name assumes that there is such a thing as a "True Scotsman", which is a smaller category than "Scotsman".
The same is being applied to "libertarian" by both sides. Gurdur was (I'm not sure why you decided to raise a four-month old thread from the dead) narrowly defining "libertarian" to justify his statement that libertarians never accomplished anything. Others were broadly defining "libertarian" to prove that they did.
The argument thus revolves around definitions, and since people are defining the word in order to prove their point, they have engaged in the "No True Scotsman" fallacy. That fallacy is entirely about defining (or redefining) words to prove your argument.
Not exactly. The fallacy is about arbitrary definitions.
Lets say that two farmers are examining a tractor to purchase. One thinks it is a good farming tractor, the other doesn't.
They can have a perfectly legitimate debate over the status of the tractor as a 'good farming tractor' without getting anywhere near a No True Scotsman. The point of the fallacy, which you'd know if you understood it, is not that the fallacy revolves around definitions, but the definitions are
arbitrary.
The definition of a True Scotsman is one who is acting like the debater thinks a True Scotsman should act like.
Libertarian, on the other hand, is a defined ideology, with a clear, reasonably concise, and defined set of values. While, like any philosophy, disagreements among the adherents exist, those cannot be confused for an arbitrary definition.
Now if someone starts talking about how people aren't true libertarians (like the Spanish Inquisition weren't True Christians, or Stalin wasn't a True Atheist) then we have the Scotsman.
No, you're doing it too! The question wasn't whether "self-identified libertarians" had accomplished anything. Just "libertarians", a word incapable of universal application.
Do you want me to demonstrate that a concept does not have to be clearly defined in order to exist? We can run the paradox of the heap yet again.
Suffice to say that a clear definition does not have to exist for a concept to be used and discussed.
I don't have to look it up to know you got it wrong. An Appeal to Authority is when people are expected to believe your argument not because it proves its thesis but because the person uttering it is a person of authority. Which has nothing to do with what you wrote (as far as I can tell).
Saying 'the founding fathers were libertarian' is pretty much like any other argument dragging the founding fathers in (they always coincidentally vaguely support the side of the arguer, while offering no additional arguments) - a classic appeal to authority.