I don’t think that people who say “the doctrine of election is unfair” understand that they don’t really want God’s fairness, because God’s fairness means He would send each and everyone who has ever sinned into hell where we would (very much rightfully) receive His holy wrath. You don’t want fair. You want grace. I think the very fact alone that He even saves people at all is a magnificent testament of His mercy.
“Just as it is written: “Jacob I loved, but Esau I hated.” What then shall we say? Is God unjust? Not at all! For he says to Moses, “I will have mercy on whom I have mercy, and I will have compassion on whom I have compassion.” It does not, therefore, depend on human desire or effort, but on God’s mercy. For Scripture says to Pharaoh: “I raised you up for this very purpose, that I might display my power in you and that my name might be proclaimed in all the earth.” Therefore God has mercy on whom he wants to have mercy, and he hardens whom he wants to harden.” | Romans 9:13-18
“But who are you, a human being, to talk back to God? “Shall what is formed say to the one who formed it, ‘Why did you make me like this?’” Does not the potter have the right to make out of the same lump of clay some pottery for special purposes and some for common use? What if God, although choosing to show his wrath and make his power known, bore with great patience the objects of his wrath—prepared for destruction? What if he did this to make the riches of his glory known to the objects of his mercy, whom he prepared in advance for glory?” | Romans 9:20-23
God is not unfair because 1) we are all sinners deserving of His wrath; 2) He is the ultimate standard of justice; 3) despite of the fact that He does not owe ANYONE salvation, He still calls sinners into fellowship with Him and gives them love, joy, peace, and eternal life. That is incredible love and grace!