I'm not sure I know what point you meant to make by this.
I read Franklin's advice as applying, and intending to be applied, quite readily in those cases where one's interlocutor is totally and clearly wrong. The idea is that you take a certain roundabout approach to telling them that they're wrong, without quite coming out and saying it straight out. The fact that they are wrong need not be in question; it's merely a matter of which tactics are effective in convincing them. (The assumption, of course, is that you're interested in convincing them.)
In any case, I am unsure in what sense your comment is a response to what I said... could you clarify?
The way I read Franklin's quote is that if someone says "well, (factual statement X) is true, and from it I draw (unwarranted conclusion Y)", we should claim to agree with him (because we agree with X) and act as though drawing conclusion Y is a minor flaw in his theory that doesn't negate the fact that he's basically correct.
But he's not basically correct. He did invoke X, and X is true, but to say that he's right, or even partially right, means he's right about a substantial part of his argument, not that he's based it on at least one statemen...
Another month has passed and here is a new rationality quotes thread. The usual rules are: