The problem is that we look at this from a gameplay perspective which means that someone could have killed over 200k enemies to get that one achievement but that would not make sense if you look at the main story. And if we want to find out if we are truly a mass murderer than we have to see it from story point. Which makes it not very easy too since we dont even know if we truly kill all the things or knock them out. Are there really so many monsters/people in a dungeon? I mean we had a few test or training dungeons where we normally should not have killed anything at all. So how many did we really kill? In the end murder is still seen as bad in Eorzea (Raubahn murdering that Lala for example) so killing people in battle or for self defense is not that bad otherwise we would have been punished by now. At the same time most of our kills go towards monsters. A lot of the story dungeons have monsters in them and I am quite sure that this would not be murder.
Also I know that your picture was meant as funny (and it is) but our WoL has shown quite a lot of emotions especially in dungeon against human bosses. We did not smile when we had to kill Edda so the WoL does feel quite the emotions too.
What would the city states truly do if we refused their help (which we could)? Suddenly say that all of our past actions are somehow wrong? Why would they kill us or try to imprison us? What if a worse enemy was on the run which is the reason why we could not help them? I can just never see Raubahn, Nanamo or Aymeric turn on us. Not only did we do something personal for them but we also helped saved their countries more than once or were the reason that their country still exist at all. Gridania might turn if the elementals would want us death but why would they? The only reason I would accept them betraying us would be something truly horrible from the WoL himself. Or if we need to sacrifice a state or something. But I am not sure if our WoL would ever be in such a situation.
Gameplay mechanics =/ story. We as the story WoL never died. Heck they even use the echo as a reason for our ingame "deaths". All of our failures are just visions of what could have happen but the WoL itself never died. Things like times never should be factored in this because you could also argue that the WoL never sleeps at all. Or that we are still living in a time bubble even after ARR, HW and SB (and even though it will take months to reach Kugane from Eorzea)
Also the WoL does suffer from stuff which is the point of the dark knight but at the same time they bear the burden and carry on because they also know that they are the last hope of the mother crystal. The journey did leave some marks on the WoL which can be seen in his behavior but he seemingly also handle stuff much better too.
But they told us that people tried to find a way to "cure" them but that they are not successfull. The problem is that they cant just simply put them away somewhere and nothing will happen. Give those people a bit of crystal or let them break free and suddenly you have another primal at your door..and unlike now where they have the WoL, a summon of another primal mostly meant the death of a huge amount of people. If this was truly a disease that just affected the person then they would have probably left them alive but the risk is way too high.