Election always concerns the saved and never the lost.
God's will is that all men be saved BUT because He gives man freedom of choice, ALL men will not be saved.
ALL men "can" be but ALL will not be. That has nothing to do with God picking some to be saved. That has to do with the Foreknowledge of God and Him knowing the future in advance.
It is true that God would want all Men saved, but without the direct intervention of His divine grace, there is a chance no Men would be saved, and the death of Christ would be in vain. Do you think God would leave the choice to choose God up to sinful Man?
No, God guarantees through His divine grace that some will be saved.
Consider Romans 3;
As it is written: “There is no one righteous, not even one; there is no one who understands; there is no one who seeks God. All have turned away, they have together become worthless; there is no one who does good, not even one.” (Romans 3 10 12)
Men left to himself will only choose sin. Man's motives will always be sinful. Man has free will to choose one sin or another sin, but the unsaved Man cannot choose God's Righteousness.
Free Will is an illusion. We think we are free to choose but in reality we choose our strongest inclination. (e.g. I'm going to lunch because I am hungry). There are always pre-determining motives behind our decisions.
If a Man does indeed freely choose in a spontaneous and capricious manor, a choice without a motive, an effect without a cause, that Man is said to be insane, mental instructions are full of free Men.
Now the difference between the saved and the dammed, consider ;
Just as it is written: “Jacob I loved, but Esau I hated.” 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. (Romans 9 13)
God has everything to do with it. God predetermined before the beginning of the world, those He would have mercy on and those He would not.
Why some and not others? For His good purpose and pleasure! We know from the Scriptures that God is good and His purpose always works toward His goodness.
So whatever God does, always works towards His goodness and His Glory! Amen!
What is shocking isn't that God saves only some, what is truly shocking is that God saves anyone at all. We have all sinned, and God in His divine justice isn't obligated to save anyone at all. And He would be perfectly just in doing so.
God gives His grace to only some and those who have His divine grace can now choose Righteousness over sin. Do you see the meaning in; "The Truth will set you free", the saved are no longer a slave to sin and can now choose Righteousness over sin.
However because we have free will, sometimes a Christian will choose sin over Righteousness because at that time and place the strongest inclination is to sin.
Last I'd like to touch on the Limited Atonement of Christ. Christ died to save only the predestine from their sin. If Lord Jesus Atoned for the sins of all Men, than what are those in hell being punished for?