rithmeres:

At the age of 13, Sokka wanted to fight. His father told him no. I can’t subject you to the horrors of battle. You’re my son; I can’t lose you. You need to stay here and protect your people. 

Sokka wanted to fight, but at his father’s wishes he stayed to protect his people. 

At the age of 13, Zuko spoke out to protect his people. His father told him no. They will be subject to the horrors of battle, and you will be too for speaking out. I don’t care that you’re my son. I will make you fight me to teach you respect. 

Zuko wanted to protect people, but at his father’s wishes he was made to fight.