W
God is love and he gives the gift of free choice. Yes God knew that Lucifer would become satan but if he had just not made Lucifer for this reason then could it really be said that we have free choice? .
now that is a good question
seemingly, before Adam and Eve ate from the fruit of knowledge of good and evil, they did not know of evil / sin / disobedience, and thus had no possible way of rebelling against God, as the only ways/ rules they knew where His. Without satan tempting them, we wouldn't really have free will, as we would not have any alternatives to choose between, I guess