It's not about ehtics being relative, it's about "evil" being a label that's used to condemn (often falsely) and discourage discussion.
Seeing WWII completely in terms of how valiant US soldiers defeated the evil Nazis is a great way to avoid noticing tendencies in the US that the Nazis would feel right at home with.
That's the message from the post I responded to, and that's what I'm responding to. You contradicted arethuza, and basically implied that arethuza'a ideas about pure evil were invalid. They're not.
It's easy to become so consumed with something that you throw the baby out with the bathwater, which you did above in claiming that evil had little use apart from propaganda.
That's false. Evil is an idea that stands on its own, and is important in our thinking.
Seeing WWII completely in terms of how valiant US soldiers defeated the evil Nazis is a great way to avoid noticing tendencies in the US that the Nazis would feel right at home with.