I don't know how you would account for unrealistic, irrational, absurd, non-existant, delusional ideas in your free-will world without referring to "antecedent conditions".The "argument" becomes merely a node in a much longer chain of "antecedent conditions." That means that the reason the argument exists at all is not because it's rational or realistic, but rather because it is whatever its "antecedent conditions" have predetermined that it would be. We can't even suppose it is a rational thing: "antecedent conditioning" could generate in us all kinds of beliefs and arguments about things that are absurd, unreal and non-existent, or delusory. There's no longer a way of judging that, since "antecedent conditions," and not rationality, are the generators of the pattern of argument and belief.
Obviously all those ideas are present in the world so they require a free-will explanation. Unless you want to say that they are proof that the world is deterministic.
This just seems to say that people with free-will would not believe in unicorns and leprechauns."Antecedent conditions" made me believe in unicorns and leprechauns. What more can I say about that?
How is that possible?
If a trusted source told you that unicorns and leprechauns exist, then ...