For everyone who does evil hates the light, and doesn't come to the light, lest his works would be exposed.
Lest their works should be reproved ...  This is the reason for the wicked's avoidance of contact with truth.  Not only would the word of God condemn his deeds, but his own conscience would be aroused against himself if it became enlightened, a discomfort which the wicked will not willingly endure, fleeing from the light to avoid it.