I wish there would be an easy solution to these 'seeds of evil'. Its easy for an outsider like you and me to say 'just forgive', because its the best and most sane thing to do. Unfortunately many human beings don't work like that, emotions often run the show.

And who knows, maybe it I experienced what they did, maybe I would be the same, or worse. I mean, if somebody raped and murdered my family in front of my eyes and laughed while doing it, forgiveness would be probably impossible for me.

The only advice that usually works - wait for few generations. Those scarred will take their wounds to the grave, and young usually don't want to carry too much of the burden of previous generations, which is good.