Honestly, the ones who are stuck in the past are plain stupid. Who are you going to take revenge for? Are you going to take revenge on people who only has past memories? People who has nothing to do with it? Why do you want to continue this pointless strife where each other's kingdoms are no longer around and life is different?
I mean, keep finding out the truth, that's fine, but when it turns into grudges or revenges, that's the line.