Causal Determinism
We can see ourselves, we are not robots, we choose, and then we can change our choices, we wish, regret, and sacrifice our choices, and this can be done only with free will. This is what it is. Man cannot wish to eat grass or live without water. These choices are not for him. If man had been free to make such choices too, he would have had him killed. Therefore, determinism is necessary to make free will productive.