Chapter 12: Whats the point of revenge if you can't chand the past?

The quote reads as follows in context:

"They have lost everything that makes them human. They do not deserve to live. That is why we must kill every single one of them. Think of it as destroying a great evil. It is the highest service you can perform for your country." The lieutenant pulled out his pistol and fired two shots into the air. People began shouting, "We must kill them all. We must make sure they never walk this earth again."

The boys have lost their families and their ability to feel. Killing is their revenge, but the people they kill aren't human to these boys..... they're simply something to destroy in revenge for what they themselves had lost.