From a Facebook group, a post by Christopher Fisher:
From the OP: “Why did [God] create Satan if He knew He would turn bad?”
It seems to be standard in this thread that people’s answer is “God knew that Satan would sin, but created Him anyway to show something rather than not create Satan along with all the evil Satan would do.”
But that is not the Biblical narrative. When God sees creatures turn out evil, He regrets making them, He is perplexed, His attempts to correct fail:
Gen 6:6 And the LORD regretted that he had made man on the earth, and it grieved him to his heart.
Gen 6:7 So the LORD said, “I will blot out man whom I have created from the face of the land, man and animals and creeping things and birds of the heavens, for I am sorry that I have made them.”
Jdg 2:20 Then the anger of the LORD was hot against Israel; and He said, “Because this nation has transgressed My covenant which I commanded their fathers, and has not heeded My voice,
Jdg 2:21 I also will no longer drive out before them any of the nations which Joshua left when he died,
Jdg 2:22 so that through them I may test Israel, whether they will keep the ways of the LORD, to walk in them as their fathers kept them, or not.”
Zep 3:7 I said, ‘Surely you will fear Me, You will receive instruction’— So that her dwelling would not be cut off, Despite everything for which I punished her. But they rose early and corrupted all their deeds.
1Sa 2:30 Therefore the LORD God of Israel says: ‘I said indeed that your house and the house of your father would walk before Me forever.’ But now the LORD says: ‘Far be it from Me; for those who honor Me I will honor, and those who despise Me shall be lightly esteemed.
Jer 2:30 In vain have I smitten your children; they received no correction: your own sword hath devoured your prophets, like a destroying lion.
Maybe the answer to Elaine’s question is that God didn’t expect Satan to turn out bad.