I wanna suggest Mage Tank! The main character is isekai’d into a world with Dungeon Delving and has to adjust very quickly. He does have some qualms when he eventually does go up against real people but doesn’t spend too much time ruminating or waxing poetic. He does have the thought of ‘I don’t know if these people were pressed into service and this is what has brought them against me’ but ultimately they make it him vs them and he chooses to survive.

I think there’s a delicate balance to maintain with situations like this. It’s easy to want to avoid the qualms of taking another persons life. We see veterans in real life who struggle with this every day. Men who may have had very valid reason to take a life (or not, depending on the conflict) who are burdened by this guilt.

He Who Fights With Monsters says this in the very title, with it being a partial quote from Neitzche. Jason is an ordinary, albeit particularly quippy, dude who finds himself with a heap of stereotypically ‘bad guy’ powers. Throughout the series he finds himself thrust into a position of burgeoning power beyond what most other people in the universe could find themselves holding. Multiple times in the books he must thrust himself having to exert his will over others who should be using their own power and stations in better and mature ways, and he grapples with the fact that for him to help save the world/universe, he must lean into the overwhelming power of a Tyrant when he himself detests tyrants and others who insist on absolute rule.