> Let's say USSR at 1941 That's a very good example of a case where people were not acting as a single group at all. Most of the soldiers were simply leaving e

> Let's say USSR at 1941 That's a very good example of a case where people were not acting as a single group at all. Most of the soldiers were simply leaving everything and retreating, because at first they were not sure if Hitler was really worse than Stalin (http://www.solonin.org/en http://www.solonin.org/en), groups of people were joining with German army sometimes hoping to get rid of soviets and sometimes because wanting to kill neighbours (e.g. https://en.wikipedia.org/wiki/Stepan_Bandera https://en.wikipedia.org/wiki/Stepan_Bandera), food was being captured from all the areas that potentially could end up under German control, which ended up causing the famine in Leningrad. So even if from afar it looks like a single group, it was much more complex and turbulent close up.