I’m not certain that the dividing line between those two senses is as crisp as you make it sound, but I guess I mean something like the latter sense. That is, I can imagine someone articulating their arguments for -P in such a way that their arguments are more compelling than mine are for P, even when P is true.
The dividing line comes from the fact that an impartial audience is not at all the same thing as a rational audience, and there’s a lot more to rhetoric than making arguments that are logically sound and tenable.
I’m not certain that the dividing line between those two senses is as crisp as you make it sound, but I guess I mean something like the latter sense. That is, I can imagine someone articulating their arguments for -P in such a way that their arguments are more compelling than mine are for P, even when P is true.
The dividing line comes from the fact that an impartial audience is not at all the same thing as a rational audience, and there’s a lot more to rhetoric than making arguments that are logically sound and tenable.