Don't you ever wonder why our government is filled with liars, thieves and criminals?
Of course the nature of the unsaved is still evil to the core of their being. And still have their allegiance bent towards Satan who they follow.
Just because Christ now has all authority over earth and heaven, does not mean evil is not allowed by Christ to continue for a time until the end. Then at the end we get a new earth and a new heaven, and all the evil will be gone, and the new creation is no more tainted with evil.
The new creation has no evil nor can evil touch it. It begins now with people becoming new creations, but at the end the universe will become new again, with no evil like it was at the beginning of the first creation in Genesis. The wicked one cannot touch God's new creation to corrupt it from what God has done.
1 John 5:18
We know that whoever is born of God does not sin; but he who has been born of God keeps himself, and the wicked one does not touch him.
1 John 5:19
We know that we are of God, and the whole world lies under the sway of the wicked one.
v18 is the new creation, Satan cannot touch as in corrupt that. It will be extended from people to the entire universe in the future.
v19, Christ and God allow evil to continue as this serves the purposes of God, or God would have wiped it out already to the utmost.
This current world is reserved for fire and destruction, as Christ said the works of the world are evil. And all that is of the world will go into the fire. However, we are not of the world and will not share its fate.
The following is still in the future but this is certain to occur.
Revelation 21
Now I saw a new heaven and a new earth, for the first heaven and the first earth had passed away. Also there was no more sea. 2 Then I, [
a]John, saw the holy city, New Jerusalem, coming down out of heaven from God, prepared as a bride adorned for her husband. 3 And I heard a loud voice from heaven saying, “Behold, the tabernacle of God
is with men, and He will dwell with them, and they shall be His people. God Himself will be with them
and be their God. 4 And God will wipe away every tear from their eyes; there shall be no more death, nor sorrow, nor crying. There shall be no more pain, for the former things have passed away.”
5
Then He who sat on the throne said, “Behold, I make all things new.” And He said [b]to me, “Write, for these words are true and faithful.”
6 And He said to me, “It[
c] is done! I am the Alpha and the Omega, the Beginning and the End. I will give of the fountain of the water of life freely to him who thirsts. 7 He who overcomes [
d]shall inherit all things, and I will be his God and he shall be My son. 8 But the cowardly, [
e]unbelieving, abominable, murderers, sexually immoral, sorcerers, idolaters, and all liars shall have their part in the lake which burns with fire and brimstone, which is the second death.”