To help me not forget. My Cambodian wife lost her parents and grandparents during those years. Its by not forgetting that one learns to be grateful for today's blessings.
This is understandable. A lot of American men after marrying a woman of Jewish descent change their online aliases to things like HitlerJugend, BabyGoebbels, Himmler1488, and so on too. It is to remember the past.