I think they struck the right balance with Fordola. They didn't excuse her actions completely but at the same time they didn't show the Ala Mhigans as particularly pleasant or rational when it came to her, either. Fordola and Yotsuyu have a lot in common - both of them were abused as early as childhood by some of their own people. It's completely understandable that it served to twist them. In Yotsuyu's case she ended up with nobody to rely upon to protect her. In Fordola's case she saw her father murdered right before her very eyes...and she almost got hit by the rocks being thrown herself.