Why will Satan be released at the end of the millennial kingdom?

Les explains that although children born in the millennial kingdom grow up with no satanic force operating and Christ ruling in benevolent power, they still inherit the same old Adamic nature as their parents. Revelation says Satan must be released for a little season at the end. Why? This whole new generation has never had to make a choice for or against God, and they must be brought to a place of choosing. They have to exercise their free will, even as everyone else had to. There is only one way to give a choice: there must be more than one option. So Satan is brought back for the sole purpose of giving these new generations, who never before had to choose, that choice. He is given full opportunity again to present his options, just as he did to Eve in the garden. Because the Kingdom has been so glorious, it will have to be the same type of temptation. Eve had it that good, but Satan's ploy was, You can be like God. Les thinks the same thing will happen here: Satan will tempt those new generations with the concept that yes, they have it perfect, but they are still not God.