Yes, the Holocaust, Ive not long finished reading the following book, "The Ethnic Cleansing of Palestine", written by a Jew
In the book, the Author recounts how in 1948, just 3 years after thier persecutions, the Jews where rounding up Palestinian men and boys aged 10 and over, getting them to dig pits, then kneel in front of them, then shoot them in the back of the head.
"Never again" I belive is their motto, if you only concentrate on the Jewish sufferings, you will miss out on even worst horrors committed by the likes of Stalins Russia, and even British bomber commands actions resulted in far worst suffering for babies in their Mothers arms than being quickly shot in the back of the head.
You will find such horrors commited by men all over the world and all over time.
So, what of God?
What should he have done for instance in the cases of men of one culture shooting people of another in the back of the head?
Suggestions and thier consequences eagerly awaited.