in chapter 15 , At first how effective is a change of environment in rehabilitating? Why does Beah say the boys “needed violence”?

At first the change did not go well. The boys were conditioned for war: they needed violence. They had been psychologically brainwashed to kill the enemy. Putting them in a peaceful situation was a shock to their psyche. They were also addicted to the drugs freely given to them by their commanders.