Children from different countries had extremely different experiences during WW2. Many children lost loved ones during the war. They had to experience all that trauma at such a young age. Some children were also sent off to war, as young as 13 and 14. They went into hiding, and some didn't see their parents for years.
The above answer is INCORRECT, at least according to Plato and a quick wikipedia article about Freud's thoughts of human behavior. He thought human behavior was IRRATIONAL, not largely rational. Everything else with the above answer is correct besides this part.