I don't, I'm not sure where you're getting that from. I just don't want her being another "Oh PTSD so sad, so bad, War is evil" character. It's stupid and terrible, and doesn't add anything to her. No one has yet to tell me what having PTSD is meant to contribute to her character.
I have been suggesting time and time again what else could be done to add to Riven's character. Look back through all my comments, I have been talking about what could be done instead of PTSD.
I don't need to read any books about a generation of War, and a Generation of warfare, that is no longer relevant to today's actual standards of War. I have first hand sources of War, from my own Dad, both of my grandfathers, my great uncle, my great grandfather, and two of my uncles. So don't act like I don't know anything.
None of them regret taking a life. Why? Because they know that if they don't, the enemies are going to take theirs. And these are Soldiers who served in the Korean, Vietnam, and Iraq/Afganhistan wars, wars that have not been just "Self-defense", but because of a political agenda.
So I don't need to read about wars to know what I'm talking about. I have first hand sources who served time and took lives, each without a regret. And you're telling me, that my family are psychopaths because they don't feel regret for taking a life that might have taken theirs?
Now let's look at actual War. War is the use of Violence to further a Political goal. Noxus itself is a fairly patriotic state, with soldiers who believe in their cause. With that in mind, if Noxus, like they have always historically done, decides to invade Ionia for their stuff, this is nothing new to them.
So they invade, and they attack. They follow the path that they have always followed, and to some degree, agree with. Unlike Demacia, Noxus doesn't script Soldiers. If you're weak, you're weak, go do something else to your own strength. So they attack, they kill, all under the guise of Glory, the sense of ethics and morals that they've been raised with since birth.
They don't feel bad, not because "they're pyschopaths", but because that is their Way of Life. The strong thrive, the weak get trampled. It's what they've always done, and how they see the world. And actually, Riven is disgusted by the use of Singed's gas weapons, but not because it's "terrible" but because it goes against their way of life.
You're meant to kill your enemies via overpowering them, by beating them with your own strength. By launching indiscriminate gas weaponry, that killed ally and enemy alike, that's entirely against that Way of Life. You can not fight Gas weapons, and your allies can't prove their strength when killed by your own weapon.
That is the entire reason Riven is disgusted. It goes against the way of life, that she and others have grown up around. She realizes that those who lead them no longer follow the same ideals. That is why she went into self-exile. Not because of the Horrors of war, but because SHE no longer agrees with a Government that doesn't follow how she lives her life.