But who are you, O man, to answer back to God? Will what is molded say to its molder, “Why have you made me like this?”
Romans 9:20 ESV

The "predestination" discussed in the previous chapter is not about determining who is and isn't saved, but what God does with those who have faith in him. He predestines them to become the image of his Son. He does the same with those who are determined to reject him, as in Pharaoh and the reprobates described in Romans 1:24. God didn’t give them over to the lusts of their hearts simply because that suited his plan, but because they willingly exchanged the glory of God for an image of corruptible man.

God makes the righteous more righteous through the operation of his Spirit and Law. He makes the wicked more wicked through the operation of his judgment and his Law.