You could say the same thing with Satan and the demonic community.
If God knew what they were going to do, why even bother creating them with free will?
I hope you get this deal figured out before you find yourself standing there trying to charge God with "culpable negligence" on judgement day. When "every knee will bow", you won't have a leg to stand on.
It's clear to me, even from a casual read, that something is going on bigger than the last 6000 years of man on earth.
It encompasses ALL of creation.
The angelic community is no doubt is watching on the edge of their seats as God
deals with eradicates the sin problem.
And there was war in heaven.
"And there was war in heaven: Michael and his angels fought against the dragon; and the dragon fought and his angels, And prevailed not; neither was their place found any more in heaven.
"And the great dragon was cast out, that old serpent, called the Devil, and Satan, which deceiveth the whole world: he was cast out into the earth, and his angels were cast out with him.
It's easy to put the puzzle pieces together.
It's not all about us here.
God's House has some vacant rooms that need to be filled.
Jesus has gone there to prepare a place for us.
Not everyone gets to go.
But a certain percentage of redeemed humanity are going to replace the "third" of the angels that were lost to Satan.
"His tail swept down a third of the stars of heaven and cast them to the earth. And the dragon stood before the woman who was about to give birth, so that when she bore her child he might devour it.
But Herod couldn't get Him, couldn't devour the child, even with the slaughter of the innocents.
God allowed Satan to do this, but a billion or more angels were watching.
Were they once friends with him, before iniquity was found in his heart?
But now they witness the result of sin as it has metastasized for thousands of years.
And why the Dragon will come to his end with on one to help him.
"And he shall plant the tabernacles of his palace between the seas in the glorious holy mountain; yet he shall come to his end, and none shall help him.