Answer:
The lesson that we are al equal.
Step-by-step explanation:
As before, during and after the holocaust, human history has been a continious clash of people with other people because of racial, ethnic or religiously motivated ideologies.
Whether it has been race discrimination in the new world, etnic clensing in former Yugoslavia or the violent conflict between Israel (!) and Palestine, the human world continue to fight every new day, as if there was no history to learn from.