If one did not choose to think and conform to standards of evidence and logic, then one is appealing to a form of automatic conceptual knowledge i.e. revelation, mysticism.
One can not have ‘all the data in the world’ (Heisenberg) and if one did it would still not be a computable problem (no closed form mathematical solution exists even for the classical many-body problem, let alone a problem set within quantum field theory). Determinism is a fantasy both metaphysically and epistemologically.
Trivially, one can make a prediction of whether a man will think or not in three hours exceeding 95% probability if one merely knows the subject’s sleeping habits and makes the prediction at midnight. A single prediction proves nothing. To prove determinism one must perfectly predict the entire course of a man’s life, and of everyone he interacts with, and everyone they interact with, .. and so on.
Other threads and other arguments pertaining to volition: