I will echo what I said earlier: one should teach their kids to think critically, to question EVERYTHING, and not spoon-feed them ideology of any sort.
There is a firm ground to be built here, and it will make the person resilient against falling prey to consumerism, against being mind-controlled by internet media, against hating and putting people into categories based on superficial qualities.
Going from "look here, the Holocaust" to "this is why we must hate Nazis" is a cop-out. The issue is more complex. Why would anybody commit such a crime in the first place? Is it in the Germans' genes? Could it happen again? Where? Why?
What's the thing that drives Nazis to be such haters? What's the nature of the hating?