This premise of this thread is a person trying to take his morality and view of murder and apply it to an environment that is not appropriate. Eorzea is a violent place. Even if a person is not an adventurer, he's going to need some basic combat skills because the realm is filled with monsters that want to kill him, or bandits seeking him. Beyond that, there's the constant threat of the beastmen and their primals as well as the Garlean military. Death is a part of the peoples' lives. No one is going to hold the WoL to account because no one considers him a murderer. If the beastmen or the Garlean Empire captured us, sure they'd execute us, but a prisoner of war and some form of judgement.

The conjurer quests dealt with this issue, since the girl wasn't willing to hurt anything. The conclusion was the elementals themselves mandated she has to, because she has to defend as well as heal. The DRK quests touched a bit on this, but it's not because we've killed people, its because we've had to kill so many people, since we're always fighting.