Isaiah 24:5 The earth is defiled by its people; they have disobeyed the laws, violated the statutes and broken the everlasting covenant.
What is it which makes this world so bad or evil? It is the people who live on it and not the creator who created it!
God gave mankind the laws to live by, and we went ahead and chose our own ways of doing things anyway!
Our free will is not corrupt. We do have the choice to follow God and do His will. It is our hearts and minds which have been corrupted and continue to choose badly.
Who started the ball rolling on that front? The evil one. Why continue to follow evil?