Weren't they also killing the minions of the demon lord from the 2nd arc which culminated in Captain Midlands eating a bullt?
I'm just saying that if you're going to have a little speech saying "we should be propper non-killy heroes" then you should at least spend some time being non killy before slaughtering every non human you can otherwise it just makes it look like you mean "we shouldn't kill people, but everyone else is fair game because they're not people"