Earlier quoted context omitted.
No, the best indicator is, "does this rhetoric serve to promote an agenda more than it serves to explain a phenomenon we did not understand previously?" Lots of conspiracy theories are plausible. With the sheer number of them, some of them will have strong elements of truth, even. Conspiracy theory isn't an epistemological designation, it's a political and rhetorical one. [ETA: To clarify, by political, I mean "withi…
"Conspiracy theories isn't an epistemological designation, it's a political and rhetorical one." Well, that's the problem. If the word was only used for baseless things, it would be taken seriously. But nowadays, "conspiracy theory" is mostly used to discredit legitimate opinions or ideologies just because the powers being don't like them.
ETA: I think I understand better the miscommunication here, I didn't mean "for political ends," I meant more, "within the context of political science." Like you might say, "it's a physical phenomenon as opposed to a chemical one."