@flannan yes, he is very human, even if he is on a fantasy world, he does not allow it to carry him away or change him.
To be honest, now that the hero left, every Jennet soldier at the capital = easy exp.
If he wanted, he could leave the Emperor on the cell with the battle horse, and kill everyone inside the castle, as we learned on this chapter, everyone with authority from Jennet where inside the castle... So, once the castle was secured, he would just need to kill all soldiers, they were not a threat to him, and he probably have enough items to keep himself alive for a long time, even if he runs out of mana, dude is stronger that any soldier with his sword alone.
He could end the war there if he wanted, problem is, if the amount of exp he earns from killing all the soldiers is not enough for him to surpass the hero, Touya, and everyone he saved will just be killed by the hero.
Besides, killing everyone is out of character for Touya.