To the reader who came here searching for "lord of the flies+essay+it's jack's fault" - you're wrong. It's not Jack's fault. If you doubt this, bear in mind that Golding himself was a teacher. He would sit during break times and watch the boys in his care. What he saw then and what he saw in his time with the Navy during WW2 chimed.
Look at what happened this week in Bezlan.
Golding knows that we created Jack, our society created him, and continues to create him. When things go so badly wrong as this, we're all at fault.