That's a serious question. I think Franklin's legacy is clouded by some moral ambiguity: his innovations were incredible, he fought for abolition and yet he didn't walk the talk.
Is that a mistake we should overlook in remembering him?
When fundies tell me our highly religious founding fathers (LOL) would want bibles in our classrooms, I always suggest the Jefferson Bible which either confuses them or freaks them out if they actually know what I'm talking about.
Most of the "bad" people in history (e.g. Hitler, Pol Pot) acted worse than the standards of their time. Nobody's justifying them or their actions with this logic.
But I take issue with forgetting about this one aspect of Franklin's character because he was simply following the standards of his time.
The question is, standards for whom? Affluent white people? The standards certainly weren't acceptable to black Americans.
I know that I may sound nit-picky, but I think it's important to apply our current sense of morality to this period in American history. When we gloss over the uncomfortable details, we gloss over some of the lessons.