Excuses will become self-refuting. No man who does not believe that Jesus is the perfect, sinless Son of God can, in his desperation and love for sin, reasonably use and misconstrue Jesus' words that unless a Christian is perfect, then that Christian cannot judge sin. Otherwise this non-believer is unconsciously entertaining a belief that Jesus, unlike any other man to ever live, was indeed perfect and sinless in His judgments and therefore that Christian is supposed to be like Him.