Izumi learned well from her father. After 100 years of war against the world, a good way to describe the Fire Nation could be tired. They shouldn't have war when it tore them so, even if it was decades ago. After everything, it's best to simply remain in a peaceful spot or in a defensive state unless absolutely necessary. You go Izumi!

The fire nation needs to repair themselves and make themselves less fueled on anger and more peaceful like they are supposed to be and how Aang and Zuko learned to firebend