The significance of the Genesis 6 story in literature from this period is much clearer. The Book of Watchers and Jubilees blame the watchers for the existence of evil spirits. These evil spirits lead people to worship idols and (in Jub.) to shed human blood.
The Origin of Sin in the Dead Sea Scrolls, Stokes
Modern New Testament study generally attributes the introduction of sin in the world to the fall in Genesis 3. Judaism in the Second Temple, or intertestamental, period attributes the source of sin to multiple beings and events. Ryan Stokes (Yale Divinity School) explores the sources of sin as understood in the works of the Dead Sea Scrolls.