As scripture say, all have sinned and fallen short of God's glory (Rom 3:23) so that all of us are at some time in our lives potentially (and unfortunately all too actually) capable of real evil. Yet no matter how depraved people may become, they remain always images of Christ the true Image of God. That image-quality may be soiled, tarnished, obscured and disfigured, but is never wholly lost, never totally destroyed.
The more we commit sin the more we weave a web around ourselves, voluntarily blocking out his light. That is why in the incarnation God punched a hole in our self-woven cocoon and thrust in a hand to drag us out: that is why Christ descended into our hell of God-forsakeness - so that we could not go on pretending to ourselves - and in that way justifying our own ghastliness to ourselves and others.
Meeting Christ in His Mysteries
Gregory Collins, OSB