This is such a sad topic but just so true that we have to be confronted with it forever in order to never act in a similar way ever again. I'm from Germany and in contrast to @daiquiri I wouldn't say that there are people not aware of our history at all (no offence)! But sadly it's true that even though we learn this in school, have monuments and museums about it there are still people (everywhere in the world) that just don't care and still (or again) have that mindset.