I quite disagree with the OP, but I think he/she could have had a better kind of argument that somehow would fit the dragon age world a little better.
If you take the example of A song of Ice and Fire (also wrongly thought to be Game of Thrones)
In the novels, you can clearly see that the actions of the big men/women of the world impact both nobility and peasants in different ways. Now, the characters didn't go completely nuts (well, let's say that some of them are) but these experiences ,mostly caused by politics, are what shaped these characters into what they are at that moment.
Now the real problem here, would be that by letting these things affect you, you would effectively take away everything that makes up for roleplay that happens in your head while you are playing. By making the character crack under the pressure, you would not be able to fully role play the tough badass ***hole that you wished to play. It's also true that it's up to the devs to implement that kind of mechanic in their game....but then again that would be restricting the ways people wish to roleplay their characters.
In the end it's quite the dilemma: either you make characters emotional and find yourself with roleplay limitations, either you leave room for roleplay, but you end up with something that isn't completely consistent with whatever seems to make sense if you were mister Lamda in that world.