There is so much evil in the world, and it’s literally hell on earth for many people, because Satan is legally god of this world.
It’s no surprise that the world that is ran by Lucifer is full of evil.
God gave Adam dominion over the world, and Adam legally transferred dominion over the world to the devil when he fell.
Satan tempted Jesus by offering Him the kingdom’s of the world, which had been delivered unto him - by Adam.
Due to Adams fall, we are all born into the kingdom of darkness, with Satan as our spiritual father - and the only escape is to change fathers by receiving Jesus and becoming a son of God - which is via adoption - and change kingdoms, by being translated into the kingdom of Gods son.
The world will remain under the devils control and filled with evil, until the second Adam returns and takes back what the first Adam lost.
Scriptures available upon request.