"Humans are authors of evil."
Well what about Lucifer/Satan? Is he a being created by God or a figure of man's imagination?
Lucifer was created good, as all God created was made good! Like humans, the angels are rational creatures endowed with free will. Lucifer and the rest of his demons fell just as humans fell from God's grace due to pride and arrogance.
But why are we concerned with Satan in this case? My point was that every time humans reject God they commit evil.