The fact is that the "younger generation" doesn't know told about these "incidents".
I know b"eh I will tell my children when they grow up about the History of Israel.
What would you suggest? I don't see current at least chabad schools/mesivta/zals teaching the history of Israel.
I don't find anything wrong with you being unaware of this prior to today. It's just as
@Yehuda57 pointed out, there's a generational gap. I also don't know how many holocaust survivors you personally knew. There are certain things that are just something one experiences. See
@CountValentine's comment about visiting Auschwitz.
And to your final question, I think the focus should be exactly as it is today in Chabad Yeshivos: spreading good and light, not dwelling (too much) on the negative (and past).