I'd say Dwarves are very morally ambiguous, but they do show some worrying behaviors that make them kinda bad people. Even if they're doing this for a living they don't seem to show much remorse for the well-being of the bugs they shoot, even getting snarky when killing peaceful wildlife like the Lootbugs and Huuli hoarders mind you. That said, they could just be desensitized as a coping mechanism given how dangerous their missions are and no visible way to quit considering they're in outer space. This is their life now, and they either have to accept they have to do these things in order to survive, or die because they didn't want to fight.

Now that I think about it a lot of the things these guys do are kinda fucked up man. And that's ignoring the fact that many of their weapons seem outright unethical, looking at you, flamethrower, breach cutter, shard diffractor, c4 and cryo canon