Why would anyone choose darkness? Because darkness seems easier! The light is blinding and burns out all the darkness. A lot of people are not willing to let the light destroy their old ways and old selves.--And when people reject the Truth, God allows them to believe a lie, because after they reject the TRUTH there's nothing left to believe but a lie!
When you've rejected God, you have no god left but Satan!--Like Adam and Eve in the Garden, when they accepted Satan's lies and believed him instead of God, and stole the forbidden fruit of the Tree of the Knowledge of Good and Evil. (See Gen.3.) The greatest sin was not eating of the fruit, but rejecting God's Truth and believing the Devil's lie and obeying him instead of God! Those who want to believe the Devil's lies will believe them!--But the Holy Spirit will show the Lord's children what's true and what isn't.
Thank God for our knowledge of His Word which has brought us out of the darkness of this World into His glorious light and the freedom of the true Gospel of Jesus Christ! "For ye were sometimes darkness, but now are ye light in the Lord: walk as children of Light!" (Eph.5:8)