We are still messing up with numbers, eg China (coronavirus). It not the numbers that matter it's man inhumanity to man and it's been going on since human time began not of course forgetting animals etc. but when we die it don't matter a crap because we will always have God.

I believe that our children need to be taught history from early childhood, because it is very important to know it. If you want to know about the best books for children that can perfectly describe the events of the Holocaust, then read the article https://www.pragmaticmom.com/2013/05/holocaust-books-for-kids/ from which you will definitely find a lot of interesting information and useful books that you should appreciate. I reread some of them with pleasure, because they are very interestingly written.