killing Sasuke will also end the so called "cycle of hatred" since Sasuke will be the last Uchiha/no one to avenge him/wage wars hmm matter fact he would be doing the shinobi world a favor by killing that international criminal.
Naruto will not kill Sasuke, it will ruin the entire point of forgiving someone. The way to peace is understanding, and simply by killing off everyone you don't understand won't bring peace.