Nature of decision making is an altogether different topic. Free will and a decision freely made are completely different things.

Look again at the definition (snitched from Encyclopedia Britannica) free will is 1) a capacity of the human intellect 2) to choose independently of natural, social, or divine restraints (different than coercion). "Free will" has nothing to do with actually making a decision or how we decide.

The key elements in human thinking are not numbers but labels of fuzzy sets. -- L. Zadeh

Which explains a lot.