Sin’s got me thinking now, goddammit. Isn’t any argument that free will exists fallacious? To say you could have acted differently at a specific point in time is to argue by false hypothesis, it seems. Or maybe it’s a circular argument and I’m misinterpreting it. Help from the 1337 7hinkz0r, anyone?
Even if you could prove that there is a parallel reality where you chose another option in a particular dilemma, that wouldn’t prove your case either: it could just be that, like some claim, the collapse of a probability function (I think that’s what it’s called) fragments the universe into several realities, encompassing all possible outcomes. You’d have to show a parallel reality where a different outcome happened, but was otherwise identical up to the decision, and then show that some other outcome, while possible, never happened in any such parallel universe.
I suppose in the end free will is really an article of faith.