@Phronimos,
Phronimos wrote:In what way can you determine whether or not you like vanilla ice cream, or say have a strong urge to gorge on vanilla ice cream? Those types of influences don't seem determined by your will at all.
I didn't say the influences were determined by the will, I said they were
determinable. When we choose, we do so with cause. We could in principle determine those causes before the decision and predict which decision we would make, and in fact that's exactly what we do, except it's not a prediction, it's the decision itself.
Phronimos wrote:
Why do you say the argument is wrong, as Van Inwagen formulates it?
Well, I'll answer that twice, because I'm not strictly arguing against Van Inwagen, I'm arguing against myself as I was being sympathetic to people who cannot tolerate the idea of deterministic will. Against my earlier comment, this is not a proof but an act of flight, a repulsion from the very idea of events 1000 years ago determining our choice of ice cream.
As for Van Inwagen, his very language on the matter sows the seed of his argument's destruction, as do all incompatibilists. "I could have done otherwise if I'd wanted to." One can never do otherwise. If I have two mutually exclusive choices, I can never do otherwise, I can simply do one of them. Will, free or not, does not allow us to do both if both are mutually exclusive. Therefore the notion that not being able to do otherwise (determinism) is incompatible with free will is ridiculous. Free will destroys the possibility of the 'otherwise's by converging to a single decision. The freedom comes from the scope of possibilities considered.
In determinism, one can very well determine what 'would have happened otherwise', i.e. under different conditions. This step is never made with free will because the only people who would make the argument are those who reject the possibility that our choices are circumstantial. And yet, if they are not circumstantial, how could we possibly choose otherwise? We only have one set of circumstances at a given moment - we can never put ourselves in the exact same situation again and choose differently. When considered alongside the fact that the will does not allow for the choosing of more than one mutually exclusive possibility, well it's sounding very compatible with determinism indeed.