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From an evolutionary standpoint, the trait of "free will" is useful only as a variable to find a more efficient/successful path when adverse circumstances make it necessary. A creature with free will is never going to survive as well as one with instincts adapted to its environment--it will make the wrong choice more often than the creature that has evolved a set of deterministic behaviors.
You can't get rid of free will entirely, because then you lose the ability to adapt if the environment suddenly shifts. But it's a losing bet, in the short term. Free will is the "random mutation" of behavioral evolution, that's all.
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