Enders Justified In Ender's Game

In the book Ender’s Game, written by Orson Scott Card, Andrew Wiggin (Ender) was chosen to save the entire human race from the Formics, most commonly known as the Buggers, who were coming back to invade humans again. Ender was recruited into the International Fleet (I.F.) where he met Colonel Graff, Director of Primary Training at Battle School. After Ender graduated from Battle School, he went off to Command School with Colonel Graff. He and the other Command School authorities did what they had to do in order to shape Ender Wiggin into the strong commander they needed to defeat the Buggers. They were justified in how they handled the final evaluation of Ender and his peers.
Colonel Graff acted secretly as Ender’s friend and mentor throughout