@Siikalahna he kills them and then what? He is clearly not some generic op isekai protag, seeing how he struggled in this subjugation mission. He will probably be executed for killing his superior, given he is nobody without even id and this officer probably some noble.
I think the choice mc made is pretty reasonable one. Two years of military service and after that you can be free adventurer with expirience and benefits from the guild is better than being in service to the king for indefinite time. Or being free from the get-go with zero knowledge and...
This is one of this stories where tension keeps bulding every chapter, but some sort of catharsis yet to happen (at least by chapter 31). Very intresting story and great art noneless, I just prefer this type to binge read.
One thing I am still curious about is what exactly king makes saintess do every night? He is not raping her I hope, because if it's true, it's understandable why GOOSE FAM dropped this.